Unidentified gunmen opened fire in a bar in central Mexico, killing ten people, according to officials, in the country’s latest outbreak of violence.

“It appears to have been a direct attack,” said a police official from Tarimoro, a town in the state of Guanajuato that has been wracked by brutal turf warfare between rival drug gangs in recent years.

The official, who spoke on condition of anonymity, said all ten victims in Wednesday’s attack were male, and that no arrests had been made yet.

A state government official said nine of the men were killed at the scene, while another died of his wounds after being taken to hospital.

Calling the shooting a “cowardly attack”, Guanajuato’s governor Diego Sinhue Rodriguez on Twitter expressed his condolences to the families of the victims.

He did not provide details of the attack.

The federal security ministry said this week that Guanajuato has seen the most murders this year among Mexican states, recording 2,115 victims between January and August.

Mexican President Andres Manuel Lopez Obrador told a news conference on Thursday morning that 20 homicides had been registered across Guanajuato on Wednesday.