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 Mary Wisniewski CHICAGO (Reuters) - The Chicago Board of Education is due to vote on Wednesday on a controversial proposal to close 54 schools in the country's third-largest public school district in what would be the largest mass school closing in the nation. The district's plans to close 53 elementary schools and a high school this year, mainly in Hispanic and African-American neighborhoods, has been met with protests by parents and union leaders who say the closings will disrupt communities and put children in danger with longer walks through troubled areas. ...