Relatives and friends continued an agonizing search for those still missing in the London bombings which killed at least 50 people as police revealed the three bombs on the Underground had gone off almost simultaneously. They most likely had been activated by people with “synchronized watches” or the bombs themselves were timed devices, Deputy Assistant Commissioner Brian Paddick told a news conference Saturday. Police also said the bombs were composed of “high explosive” — probably not homemade material. Full Story