PHOTO GALLERY: 'Depraved' attack near the Houses of Parliament in London

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Emergency services transport an injured person to an ambulance, close to the Houses of Parliament in London, Wednesday, March 22, 2017. (Photo: AP)

Emergency services staff provide medical attention close to the Houses of Parliament in London, Wednesday, March 22, 2017.(Photo:AP)

Paramedics treat an inured person after an incident on Westminster Bridge in London, March 22, 2017. (Photo: Reuters)

Emergency services transport an injured person to an ambulance, close to the Houses of Parliament in London, Wednesday, March 22, 2017.(Photo: AP)

Injured people are assisted after an incident on Westminster Bridge in London, March 22, 2017.(Photo: Reuters)

Emergency services at the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain's Parliament "as a terrorist incident until we know otherwise."(Photo: AP)

Conservative MP Tobias Ellwood, centre, stands amongst the emergency services at the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017 (Photo: AP)

An injured woman is assisted after an incident on Westminster Bridge in London, Britain March 22, 2017. (Photo: Reuters)

Injured people are assisted after an incident on Westminster Bridge in London, March 22, 2017. (Photo: Reuters)

A woman assist an injured person after an incident on Westminster Bridge in London, March 22, 2017.(Photo: Reuters)

Conservative Member of Parliament Tobias Ellwood, centre, helps emergency services attend to an injured person outside the Houses of Parliament, London, Wednesday, March 22, 2017.(Photo: AP)

Forensics investigators work at the scene after an attack on Westminster Bridge in London, Britain March 22, 2017.(Photo: Reuters)

Police officers stand at the exit as people are seen inside the pods on the London Eye after it was stopped following an attack on Westminster Bridge in London, Britain March 22, 2017.(Photo: Reuters)

An attacker is treated by emergency services outside the Houses of Parliament in London, Wednesday, March 22, 2017 (Photo: AP)

At least four people were killed, including a police officer and the man believed to be the attacker, and 20 are injured in a chaotic attack on Wednesday that spanned several locations near British parliament, in what the metropolitan police called a terrorist incident.

UK Prime Minister Theresa May condemned the "sick and depraved terrorist attack" in London saying "we will all move forward together, never giving in to terror and never allowing the voices of hate and evil to drive us apart."

Earlier today, it was reported that a woman had died and other people were being treated for "catastrophic" injuries after a car crashed into pedestrians near Westminster and an assailant stabbed a policeman.