(ABC NEWS) — American travelers to Mexico should beware of possible violent retaliation for this week’s arrest of alleged Zetas drug cartel associates and family members inside the U.S., the U.S. State Department has warned.

Though the warning does not specify which “Transnational Criminal Organization” might engage in “anti-American” violence, on Tuesday federal authorities arrested seven alleged associates of the powerful Zetas drug cartel in New Mexico and Oklahoma for allegedly laundering millions in drug profits through breeding and racing quarterhorses in the U.S. Those arrested included Jose Trevino Morales, the brother of Zetas leaders Miguel Angel and Oscar Omar Trevino Morales, who were also indicted but remain at large in Mexico.