London attacker acted alone, says police

Detectives from the Metropolitan Police's Counter Terrorism Command confirmed that the terrorist attack carried out by Khalid Masood was over within 82 seconds.

Deputy Assistant Commissioner Neil Basu, who is the Senior National Coordinator for UK Counter Terrorism Policing, said: "We still believe that Masood acted alone on the day and there is no information or intelligence to suggest there are further attacks planned."

"Even if he acted alone in the preparation we need to establish with absolute clarity why he did these unspeakable acts to bring reassurance to Londoners, and to provide answers and closure for the families of those killed and the victims and survivors of this atrocity," Basu said.

"We must all accept that there is a possibility we will never understand why he did this. That understanding may have died with him," he said.

"Nevertheless, we are determined to understand if Masood was a lone actor inspired by terrorist propaganda or if others have encouraged, supported or directed him. If the latter proves to be the case, they will face justice," he said.

The London attack was condemned by global leaders including Indian Prime Minister Narendra Modi.