Three people have been shot dead by a soldier who then killed himself at the US Army's Fort Hood base in Texas.
The gunman had served in Iraq and was being treated for mental health problems.
16 people were injured in the attack.
Fort Hood is the same base where 13 people were killed in a gun attack five years ago.
A lockdown at the site has been lifted.
The US President Barack Obama has been reacting to the shooting:
