The entire police force of a small northern Mexican town quit after gunmen attacked their recently inaugurated headquarters, according to local reports on Wednesday.

Los Ramones Mayor Santos Salinas said nobody was injured in Monday night’s attack, during which gunmen fired more than 1,000 bullets at the building’s facade, according to Noroeste newspaper’s website. Six grenades, of which three detonated, were also flung at the building, the newspaper reported.