Terror arrests: Footage emerges of London raid, as four held

Four men are being questioned for a second day by officers investigating what Scotland Yard says is an "Islamist-related" plot.

The men, all aged 20 or 21, were arrested in raids throughout the day on Tuesday which saw one of them Tasered.

Mobile phone footage shows one of the men, medical student Tarik Hassane, being led away from his home at Ladbroke Grove in west London.

Daniel Sandford reports.