Rare petroglyphs at Agua Fria National Monument in Arizona have been damaged by vandals, Arizona Central reports. The art, dating back 2,000 years to the little-understood Archaic period, was covered in paint and defaced with obscene words.

Images of the graffiti aren't available at this time, but it's not hard finding other examples of defaced Native American rock art. The picture above was taken by user jkiel of Gadling's flickr pool at Utah's 9 Mile Canyon.

The damage at Agua Fria wasn't just another case of casual vandalism so common in preserved areas. The art was well off the trail and high up a cliff. Somebody actually set out on a daytrip to destroy some of their heritage.

Damaging archaeological resources at a National Monument is not only a punk-ass move, it's also a federal crime that carries a penalty of up to a year in prison and a $100,000 fine. The Bureau of Land Management is offering a $2,500 reward for information leading the arrest and conviction of these idiots.

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