As the officers approached the border fence, a group of men ran off. They discovered the device attached to the fence and found two bundles of cannabis weighing a total of 47lb (21kg) next to the catapult.

No arrests were made and the catapult was removed.

The border, which President Donald Trump wants to reinforce with a "wall", is 1,100 miles long. Around half of it already has a fence or wall in place.