By Ian Simpson and Alice Mannette MOORE, Oklahoma (Reuters) - Rescue workers with sniffer dogs and searchlights picked through the wreckage of a massive tornado to ensure no survivors remained buried in the rubble of primary schools, houses and buildings in an Oklahoma City suburb. The massive tornado on Monday afternoon flattened entire blocks of the town, killed at least 24 people and injured about 240 in Moore, Oklahoma. ...

By Barbara Liston and Mark Hosenball ORLANDO, Fla./WASHINGTON. (Reuters) - An FBI agent shot and killed a Florida man who turned violent while being questioned about the Boston Marathon bombings early on Wednesday, the bureau said. A friend of the dead man told the Orlando Sentinel and Orlando television stations that he was 27-year-old Ibragim Todashev of Orlando, a Chechen who had previously lived in Boston. Two brothers identified by the FBI as suspects in the April 15 bombings were also ethnic Chechens with roots in Russia's volatile North Caucasus region. ...

By Edith Honan NEW YORK (Reuters) - Two years after resigning from Congress in a lewd photo scandal, former U.S. Representative Anthony Weiner announced in a video message early on Wednesday he is running for New York City mayor. "I made some big mistakes and I know I let a lot of people down, but I also learned some tough lessons," Weiner said in the video. "I'm running because I've been fighting for the middle class and those struggling to make it my entire life. ...