Texas pool party officer 'was out of control'

A white US policeman has resigned just days after a video appeared showing him pinning down a 15-year-old black girl and pointing his gun at teenagers at a pool party in McKinney, Texas.

Cpl Eric Casebolt's actions were "indefensible" and he was "out of control", McKinney police chief Greg Conley said at a news conference.

Hundreds of people earlier marched through the area demanding the dismissal of the 41-year-old officer.