Breaking news Wednesday 2.30pm GMT London
There has been an attack near to the Houses of Parliament London.
Parliament is now in lockdown and has been suspended for the rest of today.
PM Theresa May was whisked away by security personnel.
Wednesday lunchtime is PMQs and the Houses of Parliament are usually full.
A car was driven across Westminster bridge before mounting the pavement and striking down several people.
One police officer has reportedly been stabbed by a gunman. That attacker has now been shot.
CNBC report "Police in London said they were called to Westminster Bridge at 2:14 p.m. local time "for an incident," and that is is now being treated as a "firearm incident and officers are on the scene and dealing with this." Multiple ambulance crews were en route to the scene as armed police entered Parliament, some of them carrying shields, Reuters reported."
ITV news has just rounded up today's events with what is known at this time;
Some people have sustained injuries but details remain sketchy.
The incident is being treat as a terrorist incident until there is confirmation one way or another.
The situation remains fluid and the story is still unfolding.
As members of the public, tourists and reporters are in the area a variety of images are being shared and some are graphic.
Parliament is being searched and police are unable to confirm at this time whether at least one attacker is still at large.
Wednesday evening update;
At least four people have died including the police officer who was stabbed and his suspected attacker.
Social media buzzed with the alleged name and images of the attacker; later Channel 4 retracted a report as that man is reportedly still in jail.
Twitter accounts had already shared his name, footage and more. One person had actually updated a wikipedia page on the man adding today as his date of death.
This is the latest information from the Metropolitan Police Force http://news.met.police.uk/news/latest-on-westminster-incident-229843?hootPostID=771543ff5a7c584b366b8b3a360e403d