Gunmen killed 13 members of Mexican law enforcement agencies in an ambush in central Mexico on Thursday, international media reported.

According to reports, there are eight state police officers and five members of the state’s investigative police force among the victims.

Security Minister for the State of Mexico, Rodrigo Martínez-Celis, called the ambush “an affront to the Mexican state” and promised to respond with total force.

No group has taken the responsibility of the attack so far.