London: Two weeks later

London blasts cause chaos on Tube

A number of Tube stations have been evacuated and lines closed after minor blasts in what Met Police chief Sir Ian Blair says is a "serious incident".

Sir Ian appealed to Londoners to stay where they were and said the transport system was effectively being shut down.

The minor explosions - just two weeks after blasts killed 56 - involved detonators only, a BBC reporter said.

Casualties 'low'

Large areas around Warren Street, Oval and the Shepherd's Bush Hammersmith and City line Tube stations have been cordoned off.

One person was injured at Warren Street. There were reports the injured person may have been holding a rucksack containing the detonator.

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