WILMINGTON -- A fight over a boy led to the death of a 15-year-old girl at Howard High School of Technology in Delaware, according to reports.

The sophomore was fighting another girl in the school bathroom when she hit her head on a sink and lost consciousness, according to 6ABC.com.

Classes have been cancelled for the rest of the day at the school. Authorities were called to the high school Thursday at 8:18 a.m. for the assault, according to Delawareonline.com.

The girl was flown to A.I. DuPont Hospital for Children in critical condition after the incident and was later pronounced dead at the hospital, the reports said.

Wilmington Police Department detectives are interviewing students about the incident. Police told Delawareonline.com that no one outside of the school was involved in the assault.

"We are all deeply saddened by this tragedy, and my heartfelt sympathy goes out to the young girl's family and friends as they grieve this terrible loss," said Mayor Dennis P. Williams in a statement.

A mayoral debate was scheduled in Wilmington but it was postponed due to the teenager's death. The topic of the debate was public safety.

Don E. Woods may be reached at dwoods@njadvancemedia.com. Follow him on Twitter @donewoods1. Find NJ.com on Facebook.