Mexican state prosecutors say they are investigating four municipal police officers in the death of a woman in the Caribbean coast resort of Tulum.
The attorney general's office in Quintana Roo state did not identify the victim in the incident Saturday evening.
But El Salvador's Foreign Relations Ministry said she was Salvadoran.
Social media users posted videos showing a female officer appearing to kneel on the woman’s back while she was being arrested.
The videos show the victim was unresponsive and handcuffed later when several officers lifted her into a patrol truck.
Prosecutors said Sunday that one female and three male officers are under investigation.