Authorities in southern Mexico say gunmen opened fire on four local police officers, killing them and two bystanders.
Guerrero state police say two other bystanders were wounded when the gunmen shot the officers Monday in the downtown area of Coyuca de Catalan.
Police say in a statement that the four city police officers, a taxi driver and a woman who was selling food in the area died at the scene.
Coyuca de Catalan is in a mountainous zone known as Tierra Caliente that is plagued by drug violence.
More than 35,000 people have died in such violence nationwide since Mexico began a crackdown on cartels in December 2006.