A convoy of three Mexican military trucks loaded down with soldiers and weapons may have violated territorial sovereignty near Laredo, TX on Thursday, driving through a border checkpoint and crossing into the United States.

KGNS-TV reports the crossing happened at a section known as Bridge Number Two:

According to the station, which interviewed Customs and Border Protection, officers at the crossing were baffled when they heard the trucks were on their way and called Mexican authorities:

A CBP spokesperson says they got on the phone with Mexican authorities after being alerted that the military trucks were heading their direction loaded down with soldiers and weapons.

Mexican leaders say the soldiers, who had just been deployed to Nuevo Laredo, didn’t know the area, got lost and then made their way through Bridge Two.

It’s unclear if the U.S. border agents tried to stop the troops or let them through.

This isn’t the first time Mexican troops have crossed the border recently. In 2008, controversy ensued after Mexican troops crossed into the U.S. and detained a border agent: