Eight inmates with apparent gang affiliations attacked each other Wednesday night with self-made weapons, prompting a lockdown at both of Utah’s state-run prisons.

The fight broke out in a dayroom at the Utah State Prison’s maximum security Uinta Facility, located in Draper, in a part of the prison used to house inmates with gang ties, according to a news release from the prison.

Three inmates were hospitalized from the brawl, but were considered to be in stable condition as of Thursday morning. No staff members or other inmates were injured.

Officials haven’t released the names of the involved inmates, because of the on-going investigation, according to the release.

The Uinta Facility currently holds about 650 male inmates.

The Central Utah Correctional Facility in Gunnison, the other prison facility managed by the Utah Department of Corrections, was also locked down after the fight, the release states.

Unified Police Department and the state’s Department of Correction’s Law Enforcement Bureau are investigating.