BAGHDAD (Reuters) - A laboratory for the manufacture of chemical weapons was found in Falluja after a U.S. offensive to drive out guerrillas who had controlled the Iraqi city, Minister of State Kassim Daoud said on Thursday. "Soldiers from the Iraqi National Guard found a chemical laboratory that was used to prepare deadly explosives and poisons," Daoud told a news conference. "They also found in the lab booklets and instructions on how to make bombs and poisons. They even talked about the production of anthrax." On Wednesday, Marines in Falluja said they had found a banner of the insurgent group led by Jordanian militant Abu Musab al-Zarqawi in a chemicals laboratory in Falluja. But they said there was no indication the lab was used to produce chemical weapons. It was not clear whether Daoud was referring to the same laboratory. Marines said on Thursday they were not aware of any additional laboratories being discovered.