Baghdad ? Mortar shells slammed into an Interior Ministry prison Monday, killing at least five inmates and wounding 25, the U.S. military and Iraqi officials said. Separately, a fire broke out at one of Iraq’s main refineries, but the U.S. said it was an industrial accident – not an attack, as Iraqi officials insisted.

Police and hospital officials said seven inmates were killed and 23 wounded when the mortar rounds hit a prison made up of several cellblocks, each containing prisoners accused of terrorism-related crimes or civil offenses. The U.S. military said five inmates died and 25 were injured.

Police said American troops sealed off the area around the main Interior Ministry compound on the east bank of the Tigris River in central Baghdad. The rounds struck about 200 yards from the main ministry building.