Mathis police investigating a fatal shooting Tuesday evening have arrested two suspects so far and say one is on the run and may be armed and dangerous.

Police said 20-year-old Marcus Cuellar and 18-year-old Bobby Villarreal were both arrested. They are still looking for an individual named Christian Bernal who they believe is armed and dangerous.

U.S. Marshals are now helping in the investigation and the search for the suspect, Bernal.

According to police, the shooting happened around 5:30 p.m. Tuesday outside Hoff's Convenience Store. Police said there were three victims who showed up at the Mathis Police Department. One of the men did not survive. The other two were transported to Christus Spohn Shoreline Hospital as at last report were still in critical condition.

Officers are still trying to determine what sparked the violence.