Mexican Marines seized 230 40mm grenades used for grenade launchers in Matamoros, Tamaulipas, Mexico’s El Universal newspaper reported.

The marines also captured 60,000 rounds of ammunition, nine assault rifles and and eight pistols that Mexican authorities say belong to the Zetas criminal syndicate. The seizure follows last week’s capture of 12 alleged members of the Zetas with 73 assault rifles and a dozen grenades. The Zetas, whose core is made of ex-military officers, has been battling the Sinaloa Cartel and their former bosses, the Gulf Cartel, throughout the country. Recent weapons seizures indicate they may be using their power and influence in Central America to get their arms from that region.