A border incident on the Tohono O'odham Nation in Arizona is being investigated by the United States and Mexico.

According to the U.S. Border Patrol, four Mexican soldiers entered U.S. soil through the reservation on Sunday. The soldiers pointed their guns at a Border Patrol agent but retreated after realizing where they were.

The Mexican government has a different account of the incident. But Mexican soldiers often patrol the border for drugs.

The Tohono O'odham Nation lies along 85 miles of the border. Some areas are only marked with barbed wire fences.

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Mexican soldiers enter Arizona, hold Border Patrol agent at gunpoint briefly, then retreat (AP 8/6)
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