A Mission city worker discovered a 9-year-old boy that was left all alone in a field near a water tower.

Cops are now investigating how the 9-year-old child ended up alone near Business 83 and Bentsen Palm Drive, early this morning.

The boy was found sleeping and wrapped up in blankets.

Border patrol agents took over the investigation.

It is believed that the boy was traveling with a group of undocumented immigrants and was left behind.