The group camped under the bridge is still not technically in custody, Val Verde County Sheriff Joe Frank Martinez said.
Migrants camped under Del Rio, Texas bridge double to more than 9,000 people
"It is not safe, it is not healthy, for all involved, for the people that are down there underneath the bridge. It is a situation that in my opinion has gone south and it's not going to get any better until somebody does something," he said.
Shocking photos show 4,500 migrants camped under bridge in Texas community