SAN ANTONIO – A stowaway was injured after falling off a semi-truck on Interstate 37.

Around 1:45 a.m. a semi-truck driver picked up some unexpected guests at a truck stop. A man and a woman hid between the cab and trailer of the 18-wheeler.

While the truck driver was on I-37 he noticed a banging sound on the window of the cab behind him. He turned around to see a man attempting to get into the truck before he fell off.

As the driver pulled the truck over, a woman jumped off and attempted to run away. San Antonio deputies were able to detain the woman who they said is not cooperating.

The man was transported to the hospital in serious condition.

Police are actively investigating this incident.