Mexico City (CNN) -- The bodies of 10 men and a woman were found Friday afternoon on the eastern outskirts of Mexico City, a Valle de Chalco municipal government official said in a statement.
The public security official, Javier Garcia, said the victims -- all of whom were in handcuffs and bound with tape -- had been shot.
Army soldiers were assigned to secure the site in the colony Xico Tercera Seccion. Personnel from the attorney general's office initiated an investigation, he said.
The state-run Notimex news agency, citing local police, said that authorities also found in the carnage a woman clinging to life. She was taken to a hospital, where she was being guarded by soldiers and police.
The victims were found behind a well at an intersection, the agency said.
Valle de Chalco made no mention of an injured woman.
Initial reports indicate the killings were carried out where the bodies were discovered, Notimex said.