Chino Institute for Men, a California Department of Corrections Prison concluded their investigation on what started a riot that injured 240 inmates last summer. Department of Corrections spokesperson Terry Thornton said the fight began between two Los Angeles County gangs, one black and one Hispanic. Soon after the fight broke out, other inmates joined the melee.

Officials say they have charged 222 Chino Prison inmates with rules violations that will likely lengthen their stay. In addition, officials say they have 25 criminal cases pending with the San Bernardino County District Attorney's Office for crimes including attempted murder, assault with a deadly weapon, assault by inmate and conspiracy to commit murder. Jeremy Carrasco, the Lead Deputy District Attorney for the Chino Branch Office says no cases have been forwarded to his office for review.

There were no fatalities, injuries to prison personnel, no hostage situations and no escapes during the riot. However, 55 inmates were transported to area hospitals for treatment.