The shooting occurred Friday at a "quinceanera" coming-of-age celebration in the Mexican state of Guerrero, not far from the border with Michoacan, where drug-related crimes, including homicides, are a regular occurrence.
"There was a problem at a 15th birthday party, and according to the information we have, 11 people were killed," said Guerrero's governor Hector Astudillo, speaking to reporters at a news conference where few additional details were provided.
Like Michoacan, Guerrero, one of the poorest states in Mexico, has seen an explosion in drug-related abductions and homicides.
Southern Guerrero is also where 43 students disappeared in September 2014, after being attacked by municipal police and delivered to a drug cartel, which allegedly killed them.
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