The United States Consulate General in Matamoros is warning U.S. citizens about recent security incidents and violence in Ciudad Victoria.
The consulate has seen an increase in reported gun battles, grenade attacks and car bombings.
The attacks have occured near public buildings, including a city hall.
Injuries and deaths to people walking, police and members of the Transnational Criminal Organization are reported.
The consulate wants Americans especially to take extreme caution when traveling to this area.
They advise people who find themselves in a violent situation to lock themselves in a nearby building or to move behind a barrier, such as a wall.
They also suggest lying flat on the ground until the incident is over.