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 (Read 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. Read more at ABC News.

Meanwhile...

Violence from Mexico's drug war is slowing, the country's president said, after years of steadily growing carnage that has traumatized its society, hurt the economy and damaged the nation's international standing.

Mexico's drug-related murders fell about 12% during the first five months of this year, President Felipe Calderón said in an interview with The Wall Street Journal this week. That marks the first decline in violence in at least eight years.  Read more at the Wall St. Journal