How the Westminster terror attack unfolded leaving two dead after car mows down pedestrians before cops shoot knifeman outside Parliament
CARNAGE unfolded outside Parliament as a car ploughed into pedestrians on Westminster Bridge and a knifeman stabbed several people - including a policeman - before being shot.
The Met Police confirmed the attack is being treated as a terrorist incident as the central London is on lockdown.
Here's how the horrific events unfolded:
2.40pm
Reports emerge that a 4x4 has mown down up to 12 people on Westminster Bridge.
Witnesses say one woman was thrown into the Thames and a bus is forced out of control, running over several people.
The car becomes embedded on railings in New Palace Yard, outside Parliament.
A knifeman stabs a policeman - who later died - before he is shot by officers.
2.55pm
A session in the House of Commons is suspended after reports of gunfire nearby.
Journalists are told to stay in their offices as police respond to an incident.
Press Association reports that two people have been seen lying within the grounds of Parliament.
3.05pm:
Commons Leader David Livington tells MPs: "Commons Leader David Lidington told MPs: "What I am able to say to the House is there has been a serious incident within the estate.
"It seems that a police officer has been stabbed, that the alleged assailant was shot by armed police.
"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 until we have confirmation from the police and from the House security authorities about what is going on."
3.27pm
White House press secretary Sean Spicer confirms Donald Trump has been briefed on the situation in the UK.
Trump tells a meeting in the Roosevelt Room: "Just getting an update on London. Big news."
3.32pm
Police confirm they are treating the attack as a "terrorist incident until we know otherwise"
3.33pm
Pictures emerge of Prime Minister Theresa May being ushered into a silver Jaguar after MPs were evacuated.
3.50pm
The London Eye is put on lockdown, with tourists trapped inside according to ";tried and tested security procedures".
But terrified visitors say they are "sitting ducks".
4.04pm
Theresa May's official spokesman confirms she is back at Number 10 and is "monitoring the situation".
4.10pm
A junior doctor at St Thomas's Hospital says a woman has died and others have catastrophic injuries.
4.20pm
Poland's former foreign minister, Radek Sikorski, says he was in a taxi leaving Westminster when he heard "something like a car hitting metal sheet".
He said: "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.
"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.
"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."
4.25pm
An announcement in Parliament confirms a suspicious package has been found in a vehicle and a bomb squad had been called, halting a planned evacuation.
4.39pm
Mayor of London Sadiq Khan says: "There has been a serious incident near to Parliament Square this afternoon which is being treated as a terrorist attack until the police know otherwise.
"I have spoken to the Acting Commissioner. The Metropolitan Police Service is dealing with the incident and an urgent investigation is under way. My thoughts are with those affected and their families.
"I would like to express my thanks to the police and emergency services who work so hard to keep us safe and show tremendous bravery in exceptionally difficult circumstances."
4.40pm
Sky News reports a second person has been killed in the attack.
Reports say Foreign Office minister Tobias Ellwood gave the wounded policeman mouth-to-mouth amid desperate efforts to save him.
4.45pm
London Ambulance confirm they have treated at least 10 patients on Westminster Bridge, with the first ambulance crew arriving within six minutes.
The London Eye confirms guests are now being allowed to leave the tourist attraction.
4.46pm
Police confirm there will be extra patrols deployed across London tonight.
British Transport Police say there will be more officers on transport.
4.50pm
First pictures of the suspected knifeman emerge as he is seen being loaded into an ambulance.
5pm
Journalists are reportedly evacuated from the Parliament press gallery.
5.15pm
British port officials confirm they pulled a woman from the Thames who was injured but alive.
5.20pm
Christopher Hope, Telegraph chief political correspondent, tweets saying: "Senior Government sources say the police are still looking for an unaccounted for suspect in the Houses of Parliament."
5.30pm
The French foreign ministry confirms three French teenagers from Saint-Joseph high school in Brittany were among the injured.
They were part of a group of 90 pupils aged 15 and 16 visiting the city on a week-long trip.
5.32pm
Tobias Ellwood MP confirms the policeman he tried to resuscitate died at the scene.
5.49pm
TfL confirms that Canning Town station in east London has been closed due to a security alert - it is not clear if it is related.
6.03pm
Police confirm four have died in the London terror attack - including the assailant - and 20 injured.