Several sorority sisters from the University of Delaware were injured when a bus taking about 40 people to a party during homecoming week overturned in a crash with a tractor trailer, authorities said.

The crash occurred just after 10 p.m. Thusday at an intersection in Bear, south of Wilmington, when a tractor trailer ran a red light and hit the bus as it made a left turn, Delaware State Police said. The truck driver, Roberto Figueroa-Gomez, 26, of Miami was issued a summons for failing to stop at a red light, police said.

The students on the bus were members of Phi Sigma Sigma sorority and were on their way to a party, University of Delaware director of public relations John Brennan said.

A message posted overnight on the Facebook page for Phi Sigma Sigma's national organization, which is based in Elkridge, Md., said staffers had arrived at the University of Delaware and were offering assistance to sisters there.

Nine passengers were taken by ambulance to the hospital and two were admitted with injuries that were not considered life threatening, police said. The bus driver was not injured but the remainder of the 40 passengers were taken to area medical centers in private vehicles and treated for minor injuries, police said.