A spray-painted sign threatening death for U.S. Drug Enforcement Administration agents was found Friday next to a school in a northern Mexico state capital, officials said.

Addressed with profanity to "Gringos (D.E.A.)," the unsigned graffiti warned: "We know where you are and we know who you are and where you go. We are going to chop off your (expletive) heads."

Anonymous messages conveying threats and other warnings are common in areas hit hard by Mexico's drug war, but it is rarer for them to threaten U.S. law enforcement. Authorities do not know who left the message, which was removed.

The DEA referred questions to the U.S. State Department. Officials there did not immediately respond to requests for comment.

The message was left in the Chihuahua state capital, also called Chihuahua, which is about 220 miles (360 kilometers) from the U.S. border.

SAN DIEGO, CA (NBC) -- The U.S. Border Patrol has released photos of attacks on agents that they say have led to the use of pepper spray and tear gas in Mexican border neighborhoods.

Two illegal immigrants arrested in separate busts Tuesday night in the Yuma area have long criminal backgrounds in the United States, the Border Patrol said. One of the two is a convicted sex offender who has a 17-year criminal background, the patrol said

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