BREAKING: White House on lockdown after a loud noise heard

The White House is on lockdown after a loud noise was heard as press gathered outside on the South Lawn for the departure of President Obama to Selma, Ala., according to a press pool report. The president is scheduled to speak this afternoon in Selma to commemorate the 50th anniversary of the historic civil rights march. FOR THE LATEST NEWS VISIT:   USATODAY.COM