A nursing student has killed two fellow female students in their US classroom before turning the gun on herself.
The students were gunned down in front of their classmates
The 23-year-old shot her victims in front of horrified classmates at the Louisiana Technical College in Baton Rouge, Louisiana.
Students ran from the room, many crying, witnesses said, but no-one else was injured in the incident.
Friday morning's shooting is the latest in a spate of gun-related killings in the US.
Police entered the campus building within minutes of receiving an emergency call reporting gunfire at around 0830 (1430 GMT).
"There was mass pandemonium, people running," said Baton Rouge Police Sergeant Don Kelly.
"One officer - the first into the classroom - told me he could still smell gunpowder."
No motive for the killings was immediately apparent, and the names of the three women were being withheld until next of kin could be notified.
The college offers a range of vocational courses, from childhood education and practical nursing to welding.
Spate of shootings
In California on Thursday, a man suspected of murdering three family members shot dead a Los Angeles police officer and wounded another, before himself being killed after a 12-hour siege.
On the same day, a gunman burst into a Missouri council meeting and opened fire, killing five people before being shot dead by police.
Also on Thursday, a man stabbed his estranged wife in front of her class at an Ohio school before fleeing the scene, stabbing another woman, and later shooting himself after a stand-off with police.
Both women survived.
An estimated 80 people die of gunshot wounds each day across the US, according to reports.
Mass killings such as last year's Virginia Tech attacks and the 1999 Columbine High School massacre have sparked a fierce debate about gun-licence laws in the US.
Last April, a student with a history of mental illness killed 32 people at Virginia Tech university before committing suicide in the worst shooting rampage in modern American history.