The U.S. Embassy in Mexico City is warning American citizens of the possibility of a surge in violence in the wake of the arrests in the United States of several people linked to the Los Zetas drug cartel.

A security message posted on the Web site of the U.S. Consulate in Matamoros, a city in the northeastern Mexican state of Tamaulipas, warns travelers of "the enhanced potential for violence" following the arrest Tuesday of Jose Treviño Morales and several associates.

Jose is the older brother of Miguel Angel Treviño Morales, the top enforcer for Los Zetas, considered the most violent of Mexico's drug trafficking organizations.

"These arrests could result in some form of retaliation and/or anti-American violence. Given the history and resources of this violent TCO (transnational criminal organization), the U.S. Embassy urges U.S. citizens to maintain a low profile and a heightened sense of awareness," the security message says.

U.S. citizens are urged to postpone any non-essential travel to Tamaulipas, the State Department said.

Jose Treviño Morales was arrested by U.S. authorities on suspicion that his successful horse breeding operation has been laundering drug money, The New York Times reported.

Treviño Morales and several associates were detained in a massive federal operation that included raids on his Oklahoma ranch and on the Tremor Enterprises stables in Ruidoso, New Mexico. 

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