Mexico's Defense Department says a group of Mexican soldiers involuntarily crossed into the U.S. after being unable to turn around on an international bridge.
The department says that the soldiers were on patrol along the border Monday when they crossed the new Donna-Rio Bravo International Bridge over the Rio Grande. It says the only return along the bridge is on U.S. soil.
In a statement issued Wednesday, the department said the situation was clarified with U.S. immigration authorities and the troops returned to Mexico.
Mexico has maintained a strong military presence in the border state of Tamaulipas, across the border from South Texas, since early last year, when the Gulf and Zetas drug cartels broke their alliance, unleashing a bloody turf war.