Gunmen killed 10 people in a bar in Querétaro city on Saturday, while another five people were murdered in a shooting at a México state bar on Sunday.

Seven men and three women were killed and 13 other people were injured in the attack perpetrated at the Los Cantaritos bar near the historic center of Querétaro City at around 9 p.m. Saturday. Two of the injured were in very serious condition in hospital, Querétaro Governor Mauricio Kuri said Sunday.

Video footage shows that a vehicle stopped in front of Los Cantaritos before gunmen got out and entered the bar. One of four alleged aggressors was arrested after police pursued the getaway car, which the aggressors set on fire in the neighboring municipality of El Marqués.

The Querétaro Attorney General’s Office has opened an investigation aimed at detaining the other suspects.

Querétaro Mayor Felipe Fernando Macías said in a video message on Sunday that the attack was “directed” at other criminals and “derived” from the violence Mexico is experiencing on a “national level.”

The newspaper Reforma reported that the attack could be related to a dispute between criminals linked to the Guanajuato-based Santa Rosa de Lima Cartel. That criminal organization is engaged in a long-running turf war with the Jalisco New Generation Cartel (CJNG) in Guanajuato.

Macías described the attack as “unusual” and said it put authorities “on maximum alert.”

Querétaro has been largely spared the high levels of violence that plague some parts of Mexico, but there have been a number of armed attacks in the state since Oct. 1. Among more than 20 homicide victims since the beginning of last month were three people shot dead at a nightclub in Querétaro city last Thursday.