TERROR struck at the heart of British democracy this afternoon as knifemen attempted to storm the Houses of Parliament and members of the public were mown down on the street outside, leaving at least two people dead. A car ploughed through a crowd of people on Westminster Bridge shortly after 2.30pm this afternoon. Twelve people were injured before the car continued down towards Parliament, causing people to flee and jump into the Thames to avoid being struck. BBC journalist Nick Robinson said a group of French teenagers on a school trip were hit by the car while on the bridge. At least one woman died in the incident on the bridge due to "catastrophic injuries". Another person has died in unspecified circumstances. One image showed a badly injured man lying on the ground beside the bridge, possibly after falling. One witness described seeing a body "lying face down in the water" following the incident. The car then reached Parliament where one knifeman got out of the car and attacked a police officer before being shot dead. Theresa May was bundled into a police car and evacuated from the scene. A suspicious package was then discovered at Parliament sparking an evacuation. The attackers were described by witnesses as being middle-aged Asians. Scotland Yard are calling the incident a "terror attack until we know otherwise". Theresa May was in Westminster at the time of the attack and was bundled into a car by plain-clothed police officers. A Government spokesperson said she was safe. The House of Commons has been suspended for the day, while MPs are being held inside the building. Express.co.uk reporter Vickiie Oliphant reported dozens of ambulances and police vehicles were at the scnee. She said an air ambulance later landed in Parliament Square and police cordons are in place. Speaking to reporters outside the central London hospital, junior doctor Colleen Anderson from St Thomas' Hospital said a female pedestrian had died. She also said she treated a police officer in his 30s with a head injury who had been taken to King's College Hospital. She said: "I confirmed one fatality. A woman. She was under the wheel of a bus. "She died, confirmed her death at the scene." Ms 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. "There were maybe a dozen (injured)."Express.co.uk was alerted to the incident by a series of blasts before a group of people were seen running towards Parliament from Westminster Bridge. A handful of people then entered the parliamentary estate before one appeared to repeatedly attack a police officer with an implement. Journalists in the press gallery were told to stay inside offices and keep away from windows as security officers dealt with the incident.A Met Police spokesman, said: "Police were called at 14.40 to a reports of an incident on Westminster Bridge. “It’s being treated as a fire arms incident. Officers are on the scene and dealing.” Witnesses described seeing a middle-aged man carrying a knife and running.Quentin Letts, the Daily Mail’s sketchwriter, said he saw a man attack police outside Parliament before being shot. He said: “I saw a thick-set man in black clothes come through the gates into New Palace Yard, just below Big Ben." He said the man was carrying what looked like a stick as he carried out the attack.