U.S. forces attacked a suspected safe house used by an al-Qaeda linked group in Fallujah on Thursday, the military said. Hospital officials said at least four Iraqis were killed and eight wounded. Intelligence reports indicated the house was being used by followers of Jordanian terror mastermind Abu Musab al-Zarqawi to plan attacks against U.S.-led forces and Iraqi citizens, the military said in a statement. It was hit just before 5 a.m., the statement said. "Significant secondary explosions were observed during the impact indicating a large cache of illegal ordinance was stored in the safe house," it said. Witnesses said two houses were flattened and four others damaged.At least four Iraqis were killed — including two women and one child — and eight wounded, said Dr. Ahmed Khalil of the Fallujah General Hospital. "Multinational forces take great care to minimize collateral damage and civilian casualties," the military said in the statement. "Terrorists' placement of weapons caches in homes, schools, hospitals and mosques continue to put innocent civilians at risk."