A man wearing a black hood and wrapped in white bandages from his ankles to his neck was left hanging from a major bridge in Mexico City early Monday morning.
The man had two bullet wounds to the head and had “visible signs” of torture, according to El Universal newspaper.
The man, believed to be 25 years old, was hanging from the waist and was hunched forward.
The gruesome discovery was reported shortly before 4 a.m. on Puente de la Concordia, in the eastern Iztapalapa section, and it was initially thought of as a Halloween joke, the paper reported.
A cardboard sign with a warning was found below the bridge, about 100 yards away. Officials did not reveal what the warning was.
Fire department units arrived at the scene shortly after 7 a.m. and rushed to pull down the corpse and clear the area before the nearby schools opened for the day.
An autopsy is underway to determine the cause of death, officials said.
Hanging bodies from bridges and highway overpasses has been a feature of territorial disputes between cartels in other parts of Mexico, but has not been seen in Mexico City.
The phenomenon has been linked to the settling of scores between criminal organizations, who exchange messages this way or sometimes address the authorities with explanatory signs.
In 2013, nine corpses were found hanging from bridges in the border city of Nuevo Laredo, Tamaulipas.
The AP contributed to this report.