Five persons, including an armed police officer and a man believed to be the attacker, have died in a terror attack near the Houses of Parliament.
One of the victims was among several pedestrians hit by a car on Westminster Bridge, before it crashed.
An attacker, who was then shot by police, stabbed an officer-protecting Parliament.
At least 20 people were injured, including three other officers. The attacker has not yet been identified.
Acting Deputy Commissioner and head of counter terrorism at the Metropolitan Police, Mark Rowley, said a major investigation was under way into the “marauding terrorist attack”.
He said emergency services were called at 14.40
GMT after the car was driven over Westminster Bridge, hitting and injuring a number of members of the public and the three police officers, who were on their way back from a commendation ceremony.
After the car crashed into the railings of the Houses of Parliament, a man armed with a knife “continued the attack” and tried to enter the building.
He said it was believed there was only one attacker, but “I am sure the public will understand us taking every precaution in locking down and searching the area as thoroughly as possible”.
In latest developments:
- Prime Minister Theresa May has chaired a meeting of the government’s emergency Cobra committee
- Earlier, a Downing Street spokesman said: “The thoughts of the PM and the government are with those killed and injured in this appalling incident, and with their families.”
- Westminster underground station was shut and remains open for interchange only
- Home Secretary Amber Rudd urged everyone to remain calm but be vigilant and if they see anything they are concerned about report it to the police
- A group of French schoolchildren were on the bridge and three were injured
- 13 students from Edge Hill University in Lancashire were also caught up in the incident – two were taken to hospital and described as walking wounded; two others had minor injurie
- Kings College Hospital says eight patients are being treated there – six male, and two female. Two are critical and two are stable
- St Thomas’ Hospital Two said two patients had been admitted – both are stable
- Around 1,000 people were taken to Westminster Abbey for safety and were then being processed by police
- MPs were locked in the House of Commons for more than four hours and business suspended
- The House of Commons and Lords will sit at their usual times on Thursday
- Over the following days there will be extra unarmed and armed officers on the streets of London
- Paris mayor Anne Hidalgo says the Eiffel tower will go dark at midnight in homage to the London victims
- London mayor Sadiq Khan praised citizens and emergency services for their “tremendous bravery” and said: “Londoners will never be cowed by terrorism.”
Witnesses say there was what appeared to be a warning shout and then the crack of three or four shots before the attacker fell to the floor.
Foreign Office minister Tobias Ellwood – a former Army officer whose brother died in the Bali terrorist bombing in 2002 – attempted mouth-to-mouth resuscitation of an injured police officer.
The Port of London Authority said a woman was pulled alive from the River Thames near the bridge and was being treated for serious injuries. BBC