British police have released pictures of the four London suicide bombers in the hope of gathering new information about their final movements before the attacks.

British media Sunday have been showing surveillance camera footage of the four bombers with backpacks as they enter a train station (Luton) north of London the morning of the attacks.

Police believe the men rode the train to London (King's Cross station), then split up to carry out the bombings on three subway trains and one bus.

Authorities on Saturday confirmed the identities of all four bombers as investigators in Britain, Egypt and Pakistan pursued leads in the case.

Meanwhile, British Prime Minister Tony Blair called on the world to confront what he called the "evil ideology" of Islamic extremism.

The death toll from the terrorist attacks stands at 55, and is expected to rise.

Some information for this report provided by AFP and AP.