London police say they have an abundance of evidence to help them search for those who tried to set off bombs Thursday in the London subway and on a bus.
Police commissioner Ian Blair says some of the devices only partially exploded, leaving behind plenty of forensic evidence.
Police also have at least one backpack and dozens of witnesses who saw a man flee from one of the stations after his backpack partially exploded.
He eluded attempts to tackle him. Authorities say they also are studying closed circuit television pictures for clues. Four small blasts hit London subway stations and a bus Thursday.
No one was killed and one person was reported injured. Mr. Blair said it is still too early to say if there is a connection to the July seventh subway and bus bombings that killed 56 people.
Information for this report is provided by AFP.