Texas and federal authorities are searching for a tanker truck with reportedly 80 undocumented immigrants trapped inside.
Authorities say this video of the white tanker in question was recorded by a surveillance camera on Interstate 35 in San Antonio earlier this week.
On Monday night police received a desperate 911 call from a man who said he and 80 other people were trapped in the tanker.
The caller said in Spanish they were struggling to breathe and that some people had already died.
In the background, others could be heard yelling and breathing heavily.
We should warn you the 911 call in the video is disturbing to listen to.