The Latest on reports of an incident outside Britain's parliament (all times local to London):
A police commander says a full counterterrorism investigation is underway after an attack in London.
French Prime Minister Bernard Cazeneuve says that French high school students are among the wounded in the attack in London.
In a tweet Wednesday, Cazeneuve offered support to the British as well as to "the French students wounded, their families and their schoolmates."
London is a common destination for French school trips.
British port officials say they pulled a woman from the Thames River following the incident on Westminster Bridge.
The Port of London Authority says a female member of the public was recovered from the river, injured but alive.
The authority says it has closed the river between Vauxhall Bridge and Embankment while a major security operation is under way after a suspected terror attack at the Houses of Parliament in London.
Britain's Prime Minister Theresa May will chair a meeting of the government emergency committee to discuss the response to the terror incident in London.
The emergency committee known as Cobra coordinates the high-level response to serious incidents. It brings together government ministers with senior officials of the emergency services and security and intelligence agencies.
Such meetings are held after serious incidents such at the July 7, 2005, attack on London transport services.
The Wednesday meeting is held in the briefing room of the Cabinet Office on Whitehall.
The London Ambulance Service says it has treated at least 10 injured people on Westminster Bridge after a vehicle hit pedestrians.
It says the first ambulance arrived within six minutes of the first call at 2:40 p.m.
Ambulances, an air ambulance and a Hazardous Area Response Team were all sent to the scene.
One woman has been confirmed dead, and a body was seen lying in the yard of Parliament, where a knifeman stabbed a police officer and was shot by police.
People began leaving the Houses of Parliament about two hours after the incident.
A senior police commander says the attack at London's Parliament has been declared a terrorist incident and "a full counterterrorism investigation is underway."
Commander B.J. Harrington says "a number" of people have been injured, including police officers.
He says additional police officers, armed and unarmed, will be deployed across London during the evening rush hour as part of efforts to keep people safe.
The Scottish Parliament in Edinburgh suspended its debate on a second independence referendum after the incident outside the British Parliament in London.
Scottish lawmakers had been planning to vote after two days of debate on First Minister Nicola Sturgeon's call for another referendum on leaving the United Kingdom.
The debate was suspended after some members said it should be halted out of respect after a policeman was stabbed and his attacker shot in London.
Sturgeon tweeted that her thoughts were with everyone in Westminster "caught up in this dreadful incident."
A doctor says a woman has died and about a dozen people are hurt, some with "catastrophic" injuries, after a vehicle apparently hit pedestrians on Westminster Bridge, near Parliament.
Colleen Anderson of St Thomas' Hospital says a female pedestrian has died.
Anderson said: "There were people across the bridge. There were some with minor injuries, some catastrophic. Some had injuries they could walk away from or who have life-changing injuries."
She said there might be a dozen injured in all.
Poland's former foreign minister, Radek Sikorski, says he was in a taxi leaving Westminster and was checking his email when he heard something like a car crash, "something like a car hitting metal sheet."
"I look up and I see that a person is lying on the pavement. I started my camera and I saw more people lying on the street and on the pavement," Sikorski said on Poland's TVN24.
"People started running up to them. I saw one person who gave no sign of life, another man was bleeding from his head. In all, I saw five people who were at least seriously injured," he said.
"The taxi driver immediately called the emergency number. I heard ambulances within two or three minutes, so the rescue action was really very quick. There is a hospital near there."
"It all happened so fast that there was no time to get scared," said Sikorski who posted his video on Twitter. (See video at bottom of story.)
The U.S. State Department says it is closely monitoring the incident outside London's Parliament and urged Americans in London to avoid the area.
Spokesman Mark Toner said Wednesday: "We stand ready to assist in any way the U.K. authorities would find helpful."
He added that the U.S. Embassy in London is closely following the news and stands ready to help any affected Americans.
He said: "Our hearts go out to those affected."
Witness Rick Longley told the Press Association that he saw a man stab a policeman outside Britain's Parliament.
"We were just walking up to the station and there was a loud bang and a guy, someone, crashed a car and took some pedestrians out," he said.
"They were just laying there and then the whole crowd just surged around the corner by the gates just opposite Big Ben.
"A guy came past my right shoulder with a big knife and just started plunging it into the policeman.
"I have never seen anything like that. I just can't believe what I just saw."
Lawmaker Adam Holloway told the AP he saw people running and immediately ran into his offices in Parliament to be with his staff. "A lot of us are locked in with our staff at the moment," he said.
The White House says U.S. President Donald Trump has been briefed on a gun and knife incident at Britain's Parliament in London.
Trump himself said during a brief appearance Wednesday before reporters at the White House that he was just getting the news. He called it "big news."
Trump's spokesman, Sean Spicer, says the U.S. will continue to monitor the situation and update the president.
Britain's Parliament was on lockdown after -- according to officials -- an assailant stabbed an officer then was shot by police.
London Police also said officers were called to an incident on nearby Westminster Bridge
British lawmaker Grant Shapps said on Twitter that he was walking through the cloisters of the House of Commons to vote when he heard four gunshots. Police told lawmakers to get down on the ground and crawl to cover.
"Police response instant. Heard commotion, looked round. Police weapons drawn, 4 shots, police ordered us to hit ground & get back, get back," he said.
The former Polish foreign minister Radek Sikorski posted a video on Twitter that seems to show people lying injured in the road on Westminster Bridge.
Sikorski, a senior fellow at the Harvard Centre for European Studies, says he saw at least five people lying on the ground after being "mown down" by a car.
Sikorski told the BBC he "heard what I thought what I thought was just a collision and then I looked through the window of the taxi and someone down, obviously in great distress.
"Then I saw a second person down, and I started filming, then I saw three more people down, one of them bleeding profusely."
London police say they are treating a gun and knife incident at Britain's Parliament "as a terrorist incident until we know otherwise."
The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area.
Officials say a man with a knife attacked a police officer at Parliament and was shot by officers.
There are also reports of a vehicle hitting pedestrians on nearby Westminster Bridge.
A European security official says there was increased chatter on jihadi networks Tuesday following the UK's adoption of an electronics ban aboard flights from certain mostly Muslim countries.
He said, however, there was no information that the incident was terror-related.
The official spoke on condition of anonymity because he was not authorized to speak about ongoing security operations.
The leader of Britain's House of Commons says a man attacked a police officer at Parliament and has been shot by police.
David Lidington says the Parliament complex is in lockdown.
He says there are reports of further violent incidents neaby, and police say they have been called to a firearms incident on nearby Westminster Bridge.
Witnesses said a vehicle struck several people on the bridge, and photos showed a car plowed into railings.
The leader of Britain's House of Commons says a man has been shot by police at Parliament. David Lidington also said there were "reports of further violent incidents in the vicinity."
London's police said officers had been called to a firearms incident on Westminster Bridge, near the parliament.
A session of Parliament was suspended after the incident.
Britain's MI5 says it is too early to say if the incident is terror-related.
A session of Britain's House of Commons has been suspended as witnesses reported hearing sounds like gunfire nearby.
The Commons' speaker suspended the session as police responded to an incident.
Journalists at the Parliament building said they were told to stay in their offices.
The Press Association news agency reported that two people were seen lying within the grounds of Parliament.
One woman has died and many people were injured, the British Press Association said, in what police are treating as a terrorist incident at the Houses of Parliament.
The Leader of the House of Commons said a police officer was stabbed. Many of those hurt had "catastrophic injuries", the PA said.
"Officers -- including firearms officers -- remain on the scene and we are treating this as a terrorist incident until we know otherwise," police said.
One woman is confirmed to have died during the incident. Houses of Parliament, roads and Westminster underground station on lockdown. Images show a car crashed into the perimeter fence of Parliament. Members of Parliament locked in, told to stay away from windows. Police were called at 2:40 pm after reports of a firearms incident. Air ambulance at the scene to remove casualties.
London's Metropolitan Police said on Twitter they were called at approximately 2:40 pm to reports of a firearms incident near Westminster Bridge, near the main parliament building.
The incident occurred as parliament was in session, and proceedings in the House of Commons were suspended. Dozens of MPs remained in the House.
"It seems that a police officer has been stabbed, that the alleged assailant was shot by armed police," the Leader of the House, David Lidington, told MPs.
He confirmed that a serious incident had taken place "within the estate."
"An air ambulance is currently attending the scene to remove the casualties. There are also reports of further violent incidents in the vicinity of the Palace of Westminster but I hope colleagues on all sides will appreciate that it'd be wrong of me to go into further details here until we have confirmation from the police and from the House security authorities about what is going on."
Around half an hour after the attack, former Cabinet minister Anna Soubry said on Twitter she and Security Minister Ben Wallace were ordered into the Parliament lobby at gun point by police.
"Colleagues taken out of the library at gun point by counter terrorist armed police officers," she tweeted.
People were photographed running from the scene as police put the whole area in lockdown.
Police said in a statement that a full response unit had been sent to the scene, along with ambulance crews and air ambulances.
"We have declared a major incident and our priority is to assess patients and ensure that they are treated and taken to hospital as soon as possible."
Police appealed for anyone with photos or video of the incident to pass them on to police.
TV images have emerged of a car crashed into perimeter fence outside the Parliament building.
US President Donald Trump at a Women in healthcare panel told reporters he was getting updates from London.
"Some big news having to do with London just happened," he said.
Henry Mance, a political reporter for the Financial Times, told CNN that people inside have been told to stay away from windows.
Member of parliament Sir Gerald Howarth said the House of Commons was in the middle of a vote when the session was suspended and members locked in.
"It appears to be very, very serious indeed. The Leader of the House has told us it's been confirmed that one police officer here has been stabbed. It appeared that a car was coming towards the House of Commons mowing down pedestrians on the way and the driver then got access to the parliamentary estate stabbed a police officer and was shot," he said.
An Orlando man is accused of paying someone to steal his car and set it on fire so he could collect the insurance money, according to the state fire marshal.
Michael Abrams, 42, was recently arrested in connection with the December 2016 incident.
Officials said Abrams paid a man $300 to take his 2016 Toyota Camry and destroy it. Once the car was gone, Abrams reported it stolen and filed a $10,000 insurance claim, according to a news release.
Orange County Fire Rescue was called to the scene of the burning car and, with the assistance of the Florida State Fire Marshal’s Office, they determined it was an arson, officials said.
Abrams confessed to his role in the scheme, according to a news release.
“More often than not, acts of arson are committed in order to collect insurance payouts or to cover up a larger crime,” state Fire Marshal Jeff Atwater said. “To concoct the plan that he did is an elaborate act of fraud, one that undoubtedly drives up the cost of insurance for every Floridian. I’m proud of our investigative team for getting to the truth and putting this man behind bars where he belongs.”
Abrams was recently charged with arson, insurance fraud and grand theft. If convicted, he faces up to 20 years in prison.