Fort Hood memorial: Obama pays tribute to dead soldiers
9 April 2014 Last updated at 22:14 BST
President Barack Obama has said the US "could do more" to keep firearms out of the hands of those suffering from mental health issues.
Mr Obama was speaking at a memorial for the victims of a gun attack at Ford Hood military base in Texas last Wednesday.
Army Specialist Ivan Lopez was reportedly being assessed for post-traumatic stress disorder when he shot dead three men, before turning the gun on himself.