LONDON, March 23. /TASS/. The death toll in the attack near the Houses of Parliament in London stands at four and 29 people are treated in hospital, Mark Rowley, the national lead for Counter Terrorism Policing, said on Thursday.

"The latest figures I have are that there are currently four dead and 29 people were treated in hospital," Rowley said. "We are still collating numbers of walking wounded and of those in hospital, sadly 7 of them are in a critical condition."

He said the victims of the attack are a police officer and two members of the public. The fourth dead was the assailant.

The attack on Wednesday started when the assailant’s car ran into pedestrians on Westminster Bridge. He then rushed towards the Houses of Parliament and stabbed the policeman before he was shot dead by police at the scene.

"It is still our belief - which continues to be born out by our investigation - that this attacker acted alone yesterday and was inspired by international terrorism," Rowley said.

He said police had searched addresses in London, Birmingham and other parts of the country and made seven arrests.

The London attack occurred on the anniversary of suicide bombings at the airport and a central metro station of Brussels on March 22, 2016 when 32 people were killed and over 320 injured.