At least four people are dead following a shootout south of the border in Matamoros.
It all happened off Avenida del Nino in the city southeast side just before 2 p.m. Sunday.
Matamoros residents reported the shootout and gunfire on the social media network Twitter.
Witnesses reported that the firefight took place between two groups of armed men belonging to rival factions of the Gulf cartel.
Mexican authorities have not confirmed any details at this time, but witnesses reported seeing the bodies of four slain gunmen.
Action 4 News will provide more information as it becomes available.