A woman has been killed in a terror attack outside the Houses of Parliament here and several have been severely injured, while the assailant who stabbed a police officer has been shot by security forces.
Speaking to reporters outside the central London hospital, junior doctor Colleen Anderson from St Thomas' hospital has said a female pedestrian had died, reports the Guardian.
Here are the top developments so far:
. London mayor Sadiq Khan has issued a statement saying that an urgent investigation is underway and his thoughts are with those affected and their families. He also expressed his thanks to the police and emergency services for their rapid response.
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. Conservative MP Tobias Ellwood gave mouth-to-mouth resuscitation to the policeman who was stabbed.
. U.S. president Donald Trump described the incident as "big news" after he was updated on the situation.
. The Met police are appealing for pictures or video footage of the incident.
. Intelligence agencies have immediately put together teams to work on identifying who was involved in the attack and whether there was a link to a terrorist group.
. A police officer has been stabbed and his attacker shot after a major terrorist incident at the Houses of Parliament in which several people have been injured.
. The attacker mowed down several pedestrians as he drove a grey Hyundai i40 across Westminster Bridge before crashing it into railings then running through the gates of the Palace of Westminster and stabbing the officer.
. Witnesses said he was shot by police as he approached a second officer while clutching his knife.
. The Port of London Authority confirmed that a seriously injured woman has been recovered from the Thames river, however, it is yet to be confirmed if she fell or jumped from the bridge.
. The House of Commons has been put in lockdown, with many MPs confined to the Commons chamber after parliamentary business was suspended.
. Plans for a London-wide emergency have been put into place as a precaution, but police are hopeful the incidents are over.
. A Downing Street source confirmed to Guardian that Prime Minister Theresa May was "okay". May was seen being ushered into a silver Jaguar car as what sounded like gunfire rang out at parliament during the incident at around 2.45pm.
. The police say no terrorists have got into the parliament building. They say two have been caught on Westminster Bridge, and one officer is down.
. It has been confirmed that at least 10 patients have been treated for injuries on the Westminster Bridge.
. The London Eye, opposite the House of Parliament on the other side of Westminster Bridge, is also in lockdown, with some being held inside the attraction's pods.
More details to follow.