London attack: Police appeal for information on Khalid Masood

Police are appealing for information as they try to establish whether Westminster attacker Khalid Masood acted alone or was directed by others.

They said the investigation would focus on Masood's "motivation, preparation and his associates".

His fourth victim has been named as Leslie Rhodes, 75, from Clapham, south London - one of three people killed by Masood's car on
Westminster Bridge.

Police have now released six of the 11 people arrested since Wednesday.

The Metropolitan Police said the six - all arrested in Hockley, Birmingham, on Thursday morning -
had been released "with no further police action".

A 39-year-old woman, from east London, had already been released on bail until late March.

Those still in custody are:

A 32-year-old woman from Manchester

A 35-year-old man from Manchester

A 58-year-old man from Birmingham

A 27-year-old man from Birmingham

Earlier, in appealing for information from the public, Mark Rowley, of the Metropolitan Police, said they
would investigate whether Masood "acted totally alone inspired by terrorist propaganda, or if others
have encouraged, supported or directed him".

The assistant deputy commissioner 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."

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

The injured include Andreea Cristea, who had an operation for a blood clot on her brain after Masood's car hit her on Westminster Bridge and
knocked her into the River Thames.

Romania's UK ambassador said that Ms Cristea's boyfriend Andrea Burnaz, who was also injured, had been planning to propose later that day.

Source: BBC