Migrants have been detected in underground tunnels, according to video posted by U.S. Customs and Border Patrol. The video, shared on the agency's social platforms, shows migrants in these tunnels.

Further details about the tunnels and the migrants are available from the source. The tunnels pose a challenge to border enforcement.

The U.S. Customs and Border Patrol has made the video available to the public through their social media channels, providing a glimpse into the issue of underground crossings.