The U.S. consulate in a Mexican border city warns that a drug cartel may be targeting its facilities or other U.S. entry points and is urging Americans there to be vigilant, according to AP. The U.S. Consulate General in Ciudad Juarez 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 Juarez is located, to join the State Department's Smart Traveler Enrollment Program. The Juarez consulate shut its doors temporarily last July after receiving threats.