A teenager's under police guard in hospital, after a mass stabbing in central London last night.

A woman in her 60s was killed and five others injured in Russell Square.

The suspect was tasered by police at the scene.

Officers say they believe mental health may have been a 'significant factor' in the attack, but they haven't ruled out terrorism as a motivation.

Scotland Yard's assistant commissioner Mark Rowley says patrols are being stepped up as a precaution: