Eight municipal officers from Nuevo Laredo end up on the U.S. side with machine guns in hand.
The incident happened earlier tonight when a woman went into labor on bridge one on the Mexican side and needed emergency attention.
The municipal officers rushed the woman to the U.S. side of the bridge, never remembering they had their weapons.
The sight caused some confusion for people crossing the bridge, but customs officials say no one was ever in any danger.
The officers were held until all proper documentation was completed before they were allowed back into Mexico.