Gunmen believed to be linked to drug cartels killed five people in coordinated attacks in and around the northern Mexican city of Monterrey, authorities said Thursday. Three officers were wounded in Wednesday's attacks in Mexico's third-biggest city, said Jorge Domene, a spokesman for the security council in northern Nuevo Leon state, where Monterrey is located. In one of the attacks, gunmen fired on a Monterrey police station, killing a doctor who was administering tests to workers at the station and wounding three officers, Domene told a Monterrey news conference. In two other nearly simultaneous attacks in the Monterrey suburb of Guadalupe, gunmen killed two police officers, a man, and a woman, he said. "Yesterday's events clearly represent acts by organized crime trying to intimidate or reverse the actions that authorities have taken ... to counter the violence that has been unleashed in our state," Domene told reporters.