Investigators have concluded that bad food wasn't the primary cause of a fiery riot at a Kentucky prison in August.

Investigators said the inmates were instead reacting to a partial lockdown when they rioted and set fires that destroyed most of the buildings at Northpoint Training Center.

That was the conclusion a 22-page report released Friday afternoon.

Prisoners started fires in trash cans that eventually spread, seriously damaging several buildings at the medium-security facility near Burgin about 30 miles south of Lexington on Aug. 21.

The damage to the prison, which opened in 1983, was so severe that some 700 inmates had to be transferred to other lockups around the state.