DONNA, Texas (AP) — Almost three dozen uniformed Mexican soldiers in four military vehicles crossed the Rio Grande into South Texas near McAllen without authorization.

The incident happened Tuesday afternoon on the new Donna-Rio Bravo International Bridge over the Rio Grande, about 15 miles southeast of McAllen.

Federal officials were releasing little information on the incident. However, U.S. Customs and Border Protection spokesman Rick Pauza tells the San Antonio Express-News that the crossing was inadvertent and that no gunfire or injuries were reported.

Pauza said "occasionally these incidents do occur" and CBP has procedures in place for handling them.

U.S. Immigration and Customs Enforcement spokeswoman Nina Pruneda tells The Associated Press that ICE and CBP agents interviewed the 33 soldiers before sending them back to Mexico.

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Information from: San Antonio Express-News, http://www.mysanantonio.com