Authorities have sealed off a Matamoros neighborhood following a gun battle that reportedly ended with a military helicopter firing at the suspects.
It all happened the Colonia San Francisco in central Matamoros just after 1 p.m. Tuesday.
Matamoros residents turned to the social media network Twitter to report a chase and gunfire between armed men and authorities.
According to some reports, the battle ended after soldiers flying over the area in a Mexican military helicopter opened fire and killed the gunmen.
Both the Tamaulipas state government and the American Consulate in Matamoros issued alerts asking residents and visitors to avoid the area.
Mexican officials have not released further details but have reportedly sealed off the area amid an ongoing investigation.
Action 4 News will provide more information as it becomes available.