Mexican troops crossed the border into the United States Thursday, KGNS-TV reported Friday.
A convoy of three military trucks loaded with soldiers and weapons crossed the border at Bridge No. 2 in Laredo, Texas, the station reported.
Customs and Border Protection investigators told KGNS-TV they spoke with Mexican authorities after being alerted that the military convoy was heading in their direction.
Mexican officials say the soldiers didn't know the area and got lost.
An investigation into the incident is continuing.