A body is covered by a sheet outside the Palace of Westminster
A major security alert occurred in the Westminster area of central London, following what police described as a "terrorist incident". Four people, including a police officer, died.
At least 20 people have been injured in the incident.
A member of the public is treated by emergency services near Westminster BridgePolice forensic officers carry out an examination close to the Palace of Westminster in LondonA major security operation got under way after the incident began at around 2.40pmActing deputy commissioner Mark Rowley gives an update to media after today's attackEmergency services at the scene outside the Palace of WestminsterA policeman was fatally stabbed and his apparent attacker was shot by officers and later diedConservative MP Tobias Ellwood stands among emergency services outside the UK Parliament in WestminsterAround three shots rang outside parliament buildings after a man ran through the gates into the front yardPolice are treating the incident as 'a terrorist incident until we know otherwise'An air ambulance helicopter outside the Palace of Westminster on Parliament SquareA crowd of passers-by was seen running from the direction of Westminster BridgeArmed police crouch outside the Palace of Westminster