Five people died and dozens were treated for illness in Guadalajara, Mexico, after eating sausage that appears to have been poisoned, the Red Cross said. El Universal newspaper said 50 inmates at a drug rehabilitation center reported feeling ill after eating a Christmas dinner of soy chorizo, vegetables and rice. Five people died and 37 people were treated for poisoning, the Red Cross said. Medical staff at a nearby Red Cross facility call the incident a mass poisoning and say the sausage was poisoned with cyanide, the newspaper said Tuesday. Government officials from the Jalisco Institute of Forensic Science, however, said they had not yet determined the substance or chemical involved. Guadalajara officials said most of the food served at the the rehab center comes from donations.