Drug cartels may be planning to target the United States consulate in Ciudad Juárez or other official entry points.
The U.S. Consulate General in Ciudad Juárez says information of a possible attack came after the recent capture of key members of cartels active in the city across the border from El Paso, Texas.
The consulate warned Americans to be vigilant in its "emergency message" Friday, adding that in the past cartels have used car bombs.
It encouraged Americans residing or traveling in Chihuahua, where Ciudad Juárez is located, to join the State Department's Smart Traveler Enrollment Program.
The Ciudad Juárez consulate shut its doors temporarily last July after receiving threats.
This story is based on Associated Press reporting.