London attack

                                                                             bbc

Police have appealed to anyone who knew the Westminster attacker Khalid Masood to come forward with information.

Assistant Deputy Commissioner Mark Rowley said he wanted information about Masood's "associates and places he recently visited".

The fourth victim has been named as 75-year-old Leslie Rhodes, from Streatham in south London - one of three people killed by a car on Westminster Bridge.

Police said two more "significant arrests" have been made.

Fifty people were injured in the attack, with 31 receiving hospital treatment. Two are in a critical condition; one has life-threatening injuries.

Masood, 52, drove into pedestrians on Westminster Bridge on Wednesday afternoon before crashing his car into railings and then running into the grounds of Parliament, armed with a knife, where he was shot dead by police.

He used a number of aliases and was known to police. Mr Rowley said his birth name was Adrian Russell Ajao.

Mr Rowley said the investigation would focus on his "motivation, preparation and his associates".

He said police would investigate whether Masood "acted totally alone inspired by terrorist propaganda, or if others have encouraged, supported or directed him".

Mr Rowley added: "There might be people out there who did have concerns about Masood but did not feel comfortable for whatever reason in passing those concerns to us."

He also said there would be a review of Parliamentary security to see if changes were needed.

Masood - who was born in Dartford, Kent - was known to the police.

His previous convictions included causing grievous bodily harm, possession of offensive weapons and public order offences.

He was believed to have been living in the West Midlands, and had previously spent time in Crawley, West Sussex, and Rye and Eastbourne, both in East Sussex.

Asked about reports that Scotland Yard's acting head Craig Mackey was rushed away from Parliament in the aftermath of the attack, Mr Rowley said: "It's frustrating that we get nonsense like this from armchair critics."

Deputy Commissioner Mackey joined Home Secretary Amber Rudd, London Mayor Sadiq Khan and hundreds of people at a candlelit vigil in Trafalgar Square on Thursday evening to remember the people who lost their lives.

In total, 10 people have been arrested. Nine people are being questioned by police.

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