Twenty armed gang members and two police officers were killed Tuesday after a shootout in Mexico’s western Michoacán state. Another 15 people were injured, officials said. The shootout began after the gang members from the Knights Templar drug cartel blocked roads and bridges and ambushed the police patrols and ambulances. Tuesday’s violence came just one day after five people were shot and killed by Knights Templar gangsters in a demonstration protesting their violent tactics. The cartel controls much of the methamphetamine and marijuana trade in western Mexico and are war with the Zetas cartel, whose leader, Miguel Angel Treviño Morales, was arrested earlier this month.