This story has been updated.

One teenager has died and two others were seriously injured in a crash early Saturday morning in Olney, Montgomery County police said Sunday.

The three teens were traveling in a 2011 Chrysler 200 convertible on Hines Road when the car struck a tree, crossed a street, then hit a light pole and a telephone box and flipped over, police said.

Shawn Richard Gangloff, 15, of Olney, was riding in the back seat and was thrown from the car. He died at about 12:30 p.m. Sunday, police said.

The driver of the car and a passenger who was riding in the front seat were both seriously injured. Both are 17.

Montgomery County police said the cause of the crash was under investigation.