Early tests of chemicals seized at an insurgent hideout in northern Iraq indicate they included substances that could be used in explosives, the military said Sunday, according to AP. About 1,500 gallons (5,675 liters) of various chemicals were found in what the military called an insurgent chemical production facility in Mosul, 360 kilometers (225 miles) northwest of Baghdad, the military said. Officials said the materials could have been used as weapons against coalition troops. An investigation of the facility and seized materials continues, the military said in a statement Sunday. Chemical samples have been sent to the United States for further testing. U.S. troops, acting on a tip from detainees under interrogation, raided the building early Tuesday, the military said. The military did not say if anyone was detained in the raid. The military has found many suspected chemical sites in the past, none of which ended up containing chemical or biological weapons. Testing of such sites can take several days.