MEXICO CITY (AP) — Six people, including two minors, were shot to death inside a Mexico City home in a possible dispute among drug gangs, authorities said Tuesday.

Mexico City Attorney General Rodolfo Rios said the killings late Monday in Cuautepec could be revenge for last week’s slaying of an alleged drug dealer.

The northern neighborhood of Cuautepec is near Mexico state, which in recent months has seen an increase in killings linked to drug cartels.

Mexico City officials insist that drug cartels don’t have a presence in the capital like they do in other states and point to the fact that massacres and grenade attacks haven’t happened in the city of 9 million people.

But the capital’s image of tranquility hasn’t been spared and last year 12 young people were kidnapped from an after-hours bar in a normally calm downtown district of Mexico City. Their bodies were found months later in a clandestine grave in the neighboring state of Mexico. Authorities also attributed those killings to a dispute between rival drug dealing gangs.

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