Dramatic footage shows moment London stabbing suspect was arrested

This is the moment armed police swooped on a teenager suspected of carrying out a knife attack which killed a woman and injured five others in central London.

Six police officers are seen surrounding the 19-year-old - who is Norwegian.

One officer, wearing blue gloves, appears to check the suspect's head as he lay on the ground after being Tasered near Russell Square.

The suspect was later taken to hospital before being released and officially arrested on suspicion of murder.

Police said the evidence so far suggests the attack was not "in any way motivated by terrorism" and that the suspect had not been radicalised.

Assistant Commissioner Mark Rowley said the incident on Wednesday night is likely to have been "triggered by mental health issues".