Channel 4 will air two documentaries to mark the third anniversary of the 7/7 bombings.

In 7/7: The Miracle of Carriage 346 survivors of the bomb on a Piccadilly Line tube train will recall the events.

Then 7/7: The Angels of Edgware Road will recount the second attack through interviews with those who passed by the devastated scene and people who helped in the rescue effort.

"There stories are not only incredibly powerful, but they also tell us something about human nature," said Channel 4 specialist factual editor David Glover.

"Bystander apathy does not always kick in, but here when it really mattered people risked their own lives to save strangers."