In pictures: 7/7 bombing CCTV clips

CCTV footage of the London bombings has been shown to jurors at the trial of three men who deny helping with target reconnaissance. One piece shows a train leaving Liverpool Street station in July 2005.

Moments later smoke engulfs the platform and commuters run away. Police officers could be seen running in the direction of the train on which seven people died.

In a second clip, the number 30 bus passes the British Medical Association's reception on Tavistock Square.

Seconds later, people in the building can be seen to duck as Hasib Hussain detonates a bomb on the double-decker bus just outside.

Further CCTV images show Mohammed Siddique Khan, Shezhad Tanweer and Jermaine Lindsay travelling around the capital nine days before the attacks, scouting for targets.

These three suicide bombers and Hasib Hussain killed 52 people in total and injured nearly 800 in the bomb blasts on 7 July 2005