Fort Hood military installation in Texas has been locked down after a gunman opened fire, injuring an undisclosed number of people.
The gunman opened fire in Fort Hood in central Texas, injuring an unknown number of people at the U.S. Army base that was the scene of a shooting rampage in 2009.
Emergency crews are immediately on the scene. However, no further details are known at this time," the base said in a statement.
The base has been put on lockdown and police are securing the perimeter.
It was not immediately clear how many people were injured. The shooter is believed to be at large, according to authorities.
Local news reports said there may be two suspected shooters.
Authorities advised all personnel on the post to stay away from windows and to keep all doors closed and locked.
Both President Obama and Secretary of Defense Chuck Hagel have been informed of the shooting.
The base was the site of a shooting in 2009 that ultimately killed 13 people and wounded another 32, the worst mass murder at a military installation in U.S. history.