London Underground operators on Tuesday reopened sections of two subway lines that had been closed since the deadly July 7 bombings, while police maintained a high-profile security operation throughout the network. Officers continued questioning 20 suspects held in Britain in connection with the botched July 21 bomb attacks on London’s transit system, including two men arrested in raids in south London late Monday. The government said it was trying to extradite from Rome one of the suspected attackers; Italy also arrested two brothers of that suspect. Full Story