Four men with their hands and feet tied and heads covered in duct tape were thrown 600 feet to their deaths from a bridge near Chilpancingo on Friday, authorities said as Mexico's increasingly bloody drug battles reached a new level of cruelty and intimidation.
The four were among 12 people killed Friday in and around Acapulco, which has seen a spike in violence since rival factions of the Beltran Leyva cartel began fighting over territory after leader Arturo Beltran Leyva died in a battle with Mexican marines in December 2009.
The unidentified men were dropped from a 600-feet-high bridge on a highway that leads from Acapulco to the city of Cuernavaca on to Mexico City, said the Public Safety Department in Guerrero state, where the city is located.
The men had bruises all over their bodies and "it's presumed they were thrown alive from the Solidarity bridge," the statement said.
Drug gang members have taken increasingly drastic measures seeking to intimidate rivals, from beheadings to skinning their victims.
Guerrero state authorities said earlier Friday that eight people, including four teenagers, were slain before dawn in a string of attacks throughout Acapulco. Guerrero state police said it was not clear if the attacks were related.
Nationwide, nearly 35,000 people have been killed in drug-gang violence since President Felipe Calderon deployed troops and federal police four years ago to crush the cartels in their strongholds.
In Mexico's north Friday, soldiers killed eight suspected drug cartel members in two clashes near the industrial city of Monterrey, the military said.
Soldiers intercepted a group of gunmen toting high-powered rifles and a grenade launcher and chased them into the Monterrey suburb of Guadalupe, where a shootout left five gunmen dead, Mexico's Defense Department said in a statement.
Another group of gunmen later fired on soldiers in Juarez, another Monterrey suburb, sparking a firefight that killed three attackers, it said.
Monterrey and the surrounding area has suffered a surge in drug violence as the Gulf Cartel battles the Zetas group for territory.