Amy Inita Joyner-Francis, whom police have not identified but local news source The News Journal identified by name, was a sophomore at Howard High School of Technology in Wilmington, Delaware.
A statement from the school indicated that a "physical altercation" began in the girl's bathroom at 8:15 a.m. on Thursday, April 21.
"She was fighting a girl, and then that's when all these other girls started banking her - like, jumping her - and she hit her head on the sink," Kayla Wilson, a student at Howard High school, told a local TV station, according to The Associated Press. Wilson was in a bathroom stall when the fight broke out.
Joyner-Francis was then airlifted by helicopter to AI duPont Hospital, where she later died from her injuries. Neither the school, nor local police, have provided additional details about the injuries she sustained or the details of the fight. The police are conducting an investigation.
Two female students have been questioned by the police, Wilmington police Chief Bobby Cummings told The News Journal.
"My heart bleeds for the family," Wilmington Mayor Dennis P. Williams said at a press conference. "Things like this shouldn't happen."