A man's headless body was left hanging off a bridge in Huixquilucan, one of the wealthiest cities in the central state of Mexico, which surrounds the Federal District and forms part of the Mexico City metropolitan area, police said.

The body was strung up Monday by the legs and the head was left inside a trash bag placed on the bridge, Huixquilucan police chief Gerardo Oyervides told Efe.

"A sign with a message supposedly signed by the La Mano con Ojos criminal organization was found" on the bridge, the police chief said.

A security guard at a subdivision near the Paseo Interlomas bridge, located across from the highly respected Hospital Angeles, spotted the body and called police.

Police removed the body and the investigation is being handled by "the coroner's office and the corresponding authorities," Oyervides said.

Municipal police will step up patrols in the area, coordinating their actions with state police and the army, the police chief said.

The killing comes days after the arrest of La Mano con Ojos leader Oscar Osvaldo Garcia Montoya, who confessed to participating in 300 murders and ordering 600 other hits.

La Mano con Ojos controls drug dealing in Huixquilucan, located in the Mexico City metropolitan area, officials said.

The gang, known for beheading its enemies, has been fighting for control of the drug trade in the cities of Naucalpan, Atizapan, Tultitlan, Cuautitlan Izcalli and a section of the capital.

A total of 18 men and two women have been killed by the gang in Mexico state since November 2010, officials said.