Three people were killed and five injured during an attack on Acapulco's La Reina Gay festival on Sunday.

According to the AFP, an unknown number of gunmen opened fire on the crowd.

The attack left three men aged 23 to 33 dead and sent five others to a private hospital for treatment.

Acapulco, a major seaport in the Mexican state of Guerrero, is Mexico's largest resort city and attracts many tourists. But Acapulco also has the highest homicide rate of any city in Mexico.

A recent spike in violence near the city has led authorities to suspend classes at some rural schools. Security forces have also been installed at some schools.

It was unclear whether the attack was motivated by anti-LGBT animus.