British authorities say they have evidence that at least one of the bombers who carried out last week's terrorist blasts in London died in the explosions.
Top British anti-terrorism official Peter Clarke says authorities are now seeking to determine whether all four bombers were killed. He said closed circuit television footage shows all four arriving at the Kings Cross subway station about 20 minutes before the blasts ripped through three of the trains. He said the investigation remains in its early stages.
The official also announced the arrest of a suspect following police raids earlier Tuesday in the northern English city of Leeds. He said materials gathered in the searches are undergoing forensic examination.
52 people have died in the underground blasts and in the explosion on a double- decker bus above ground about an hour later.
Earlier British Foreign Secretary Jack Straw urged the European Union to quickly implement plans for closer coordination in the struggle against terrorism. He urged the European Parliament in Brussels, to give police easier and faster access to telephone and internet data. But he stressed that this should not restrict individual freedom.