Two Mexican officials say authorities have found what they believe are at least 19 bodies tossed into a deep, narrow canyon in the violence-plagued southern state of Guerrero.

The federal officials said eight of the bodies had been partially burned, and two more were found in pieces. Authorities were not ruling out the possibility of finding more bodies.

They were found in a canyon about 1,500 feet (500 meters) deep in a mountain area west of the state capital of Chilpancingo.

The officials said Tuesday the bodies were found late last week after authorities received an anonymous tip. The officials spoke on condition of anonymity because they were not authorized to be quoted by name.

The mountainous area is dominated by drug gangs, and local farmers frequently grow opium poppies.