A community activist was murdered over the weekend in Mexcaltepec, a town in the southern Mexican state of Guerrero, media reports said.

Rocio Mesino Mesino was killed by gunmen on Saturday in the remote community.

Mesino, leader of the Peasants Organization of the Sierra del Sur, was at a community dining hall she established for the volunteers building a temporary bridge over the Atoyac River to assist residents of communities cut off last month by Hurricane Manuel.

Two men arrived on a motorcycle and asked Mesino if they could cross the temporary bridge, eyewitnesses said.

Mesino told the men the bridge could not yet handle vehicles but could be crossed on foot, eyewitnesses said, adding that the community activist turned her back and one of the men shot her three times.

"Immediately, the two individuals fled on the bike, and the one who was not driving pointed his pistol at the people to avoid being captured," La Jornada de Guerrero newspaper reported.

Investigators are working to solve the activist's killing, the Guerrero Attorney General's Office said.

Two individuals murdered Mesino, the AG's office said, citing statements from eyewitnesses.

"One of them was driving the motorcycle and distracted the victim, while the other fired at short range at the community activist's back," the AG's office said.

Mesino served on the city council of Atoyac when she was a member of the leftist Party of the Democratic Revolution, or PRD.

The community activist accused Atoyac Mayor Pedro Brito Garcia of being behind a plot to kill her in 2007.

Mesino resigned from the PRD before the last elections, accusing the party of supporting only special interests, and ran on the Citizens Movement ticket, press reports said. EFE