12:35 PM ET - AP is reporting that in Rome, Somali Osman Hussain, believed to be the fourth suspect in the bombings, was also arrested Friday. AP has more.
2:32 PM ET - AP is reporting that London police have said they will ask Italy to extradite terror suspect Osman Hussain, arrested in Rome earlier today. Read the transcript of a London Metropolitan Police press conference on the arrests.
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