SALEM, Mass. -- A fight that broke out at a Salem State College dance Thursday night ended up with two people stabbed and several police officers injured.

One person, identified as David Johnson, 24, was stabbed in the stomach and was in serious condition in the hospital. He was scheduled to be arraigned on disorderly conduct charges on Friday morning.

NewsCenter 5's Gail Huff reported that the brawl erupted about midnight at a school-sponsored dance taking place inside the school's Harrington gymnasium attended by approximately 500 people.

"It was just mayhem. Everybody started running out of the doors and four entrances all over the place," Police Chief William Anglin said.

A total of seven arrests were made as officers tried to get control of the crowd.

"They were bleeding, then we determined that both of them had been stabbed. It was an unfortunate circumstance. Two people started fighting and then five or six others -- there was a total of seven arrests -- five or six others jumped on police officers' backs. One Salem police officer was punched. My deputy chief was assaulted with a bicycle," Anglin said.

Police had not found any the weapons as of Friday morning. The two stab victims were not students at Salem State. It's unclear what started the fight. No suspects have been identified.

"We have no suspects in the assault. We're trying to get back and interview people but at this point in time we don't have any information,"Anglin said.

People attending the dances have to go through metal detectors. Two knives were confiscated before Thursday's fight broke out. Police said the dances are open to the public, and about half the people attending the dance were not college students.