Two vehicles and a window at the news company were damaged by shrapnel” in Sunday night’s attack, the AG’s office said.

The evidence gathered by investigators does not point to any specific individual or group being behind the attack, the AG’s office said.

Unidentified individuals riding in an automobile threw an “explosive device” at the newspaper’s offices on Venustiano Carranza boulevard in the Republica de Saltillo section of the state capital, the AG’s office said.

There was no comment from Vanguardia representatives about the attack.

Numerous attacks on media outlets and reporters have occurred in Mexico in recent years, with the majority of the incidents blamed on drug traffickers.

Both international press rights groups and Mexican journalists’ associations have repeatedly called on the government to protect freedom of the press and expression.