Coalition forces killed eight suspect insurgents and detained 13 others while discovering a possible execution site and torture room as well as weapons caches in the Diyala River Valley in Iraq, officials said.

The discoveries were made during an operation from Nov. 6 to 10 in the area north of Baghdad, according to a news release issued Monday by Multi-National Force-Iraq.

Coalition forces discovered what appeared to be an execution site on Nov. 9. As they cleared the area they found the remains of about five people and several 9 mm casings believed to be used in their executions.

Coalition forces found and destroyed 16 weapons caches including anti-aircraft weapons, missiles, mines, mortars, fuses, rounds, rifles, grenades, ammunition and other items.

Troops found several buildings thought to be used by insurgents, including a possible torture facility outfitted with chains, shackles, locks similar to those found in detention cell bunkers, windows cemented shut, propaganda materials and kerosene heaters.

A building believed to be an al-Qaida in Iraq safe house contained propaganda and a medical clinic with supplies, weapons and a hidden compartment in the floor.

Nearby, they discovered what appeared to be a building with materials used to make false IDs.

Coalition forces also found a facility with bomb-making materials including numerous cylinders, tanks, tubes and car parts.

An airstrike was ordered destroy the building and prevent insurgents from using it.

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