Man hung from Mexico bridge, shot to death

Authorities say gunmen hung a man from a pedestrian bridge over a busy avenue in the Mexican city of Monterrey and shot him to death in front of dozens of motorists.
A police investigator in Nuevo Leon state, where Monterrey is located, says the man was alive when he was hung and died after being shot.
The investigator, who spoke on condition of anonymity because he was not authorized to discuss the case, says the assailants left a threatening message but he wouldn't reveal what it said.
Monterrey's overpasses have seen several gang killings this year, often carried out in daylight in view of drivers on busy streets below. Tuesday's shooting took place on Constitution Ave.
The Gulf and Zetas drug cartels are fighting for control of the city.