CHESTER, Ill. (AP) _ One inmate was killed and 13 injured Monday night in a free-for-all fight between two rival Chicago gangs at the maxium-security Menard Correctional Center.

Authorities said no prison employees were injured in the fight, which broke out at the Southern Illinois prison shortly after 7 p.m.

Menard Warden Jim Greer declined to release the names of those injured or the name of the dead inmate pending notification of family, adding that none of the surviving inmates suffered life-threatening injuries.

Greer would not identify the gangs involved, but said the dead inmate suffered wounds inflicted by a fellow inmate.

The fight erupted when one inmate tripped another while 300 or more inmates were being escorted from the recreation area to the main cell house, Greer said. The inmates' weapons ranged from fists to makeshift knives and clubs.

''Sometimes, they don't need any reason to fight,'' Greer said.

It took officers 15 minutes to break up the fight and another 1 hours to secure the prison, he said.

Three of the injured inmates, including the one who died, were taken to Memorial Hospital in Chester. The other 11 were treated at Menard.