Following the shooting in Parkland, Florida, the White House said President Donald Trump "is supportive of efforts to improve the federal background check system" for gun purchases.
The cities of New York, Philadelphia and San Francisco are suing the Department of Defense for failing to consistently report convictions to a federal database that is checked before firearms purchases.
Tuesday night was supposed to be a high point of Annabelle Pomeroy's year.
A Texas family that lost eight members, including a woman who was pregnant, in a mass church shooting has filed a wrongful death claim against the US military, asserting the Air Force's negligence helped the gunman acquire his weapons.
Attorney General Jeff Sessions on Wednesday ordered a comprehensive review of the national database that houses background checks.
A call to police about "shots fired" at a church in eastern Tennessee turned out to be an accidental shooting during a discussion on using weapons to protect the congregation, police say.
At least 26 people were killed at First Baptist Church in Sutherland Springs, Texas, when a gunman opened fire during a Sunday church service. Here's a look at the victims of the attack.
At least 26people have been killed and many more injured in a shooting Sunday at First Baptist Church in Sutherland Springs, Texas, authorities said.