A 17-year-old US high school student has stabbed a 16-year-old classmate to death after a fight about a boy turned into a deadly clash.
The fight between the two "straight A students" took place during an economics class at a high school in suburban Detroit on Wednesday with the victim later dying in hospital.
Warren Police Commissioner William Dwyer said the girls knew each other and had no history of trouble but said the attacker became upset when her boyfriend broke up with her and started dating the victim. A steak knife was found at the scene.
"This is truly a tragedy. ... This appears to be an altercation between two students and we're investigating to determine why this occurred," Dwyer said.
Fitzgerald Public Schools Superintendent Laurie Fournier identified the slain girl as Danyna Gibson and said a vigil to remember and honour her will be held on Thursday.
A witness, Francesca Pascua, 17, told The Detroit News that the stabbing occurred in an economics class.
"I heard screaming, and I thought everyone was running from a bug or something," said Pascua, who fled because, "I thought she was going to stab everybody."
The suspect was arrested at the scene and is being held at a police lockup until the arraignment, which could happen Thursday. Dwyer said she probably will be charged with murder.
Australian Associated Press