Mexico has sent 80 soldiers and an army helicopter to the western Michoacán state after a shooting in which at least 13 police officers were killed. The police were carrying out a court order in the town of El Aguaje when they were ambushed by gunmen on Monday. A powerful criminal group, the Jalisco Nueva Generación Cartel, is believed to have carried out the attack. Separately, 14 armed civilians and a soldier died in a gunfight in the western state of Guerrero on Tuesday. The state government said the soldiers were responding to an emergency call in the municipality of Tepochica, near the city of Iguala, when they were attacked by the gunmen and returned fire. It was not immediately known if the two attacks were related. Also on Tuesday, Mexican President Andrés Manuel López Obrador said his tough policies on drug crime would eventually pay dividends. "I'm optimistic we'll secure peace... we're completely dedicated to this issue, but [past governments] allowed it to grow," the president was quoted as saying by Reuters news agency.