A nude gunman has killed four people at a Waffle House in Nashville in the US state of Tennessee, police say.
The man burst into the restaurant at 03:25 (08:25 GMT) in the suburb of Antioch and opened fire, reportedly with a semi-automatic rifle.
Four other people were wounded. A customer wrestled the weapon from the man, who then fled the scene on foot.
Police are hunting for the suspect, whom they identified as Travis Reinking, 29, from Illinois.
The gunman arrived in his pick-up truck, shot people outside the restaurant before firing more shots inside, Nashville police spokesman Don Aaron said.
Police also say he was naked except for a green jacket, which he shed as he left the scene.
He was armed with an AR-15 rifle, a weapon commonly used by mass shooters in the US, media reports say.
Similar rifles were used in the Las Vegas shooting last October that killed 58 people, and the Florida school attack in February that left 17 students and staff dead.
Debate over gun control intensified following the Florida shooting, with mass protests and school walkouts across the country demanding stricter legislation in recent weeks.