White House lockdown after loud noise is heard

The US Secret Service locked down the White House Saturday after a loud noise was heard as reporters gathered to await President Barack Obama and wife Michelle's departure for Selma, Alabama, a pool report said. A Secret Service K9 unit was investigating a vehicle on 16th and Constitution Avenue which borders the South Lawn of the White House, agency spokesman Brian Leary said in an email. The Washington DC Fire Department, meanwhile, reported a fire at a food cart on 15th Street NW on the