A bus carrying a high school drill team plunged over a mountainside embankment Saturday, killing one adult and injuring 25 other people, authorities said.

The chartered bus lost control as it traveled on U.S. 209 near this eastern Pennsylvania town and slid 150 feet down an embankment, said State Police Cpl. Leonard Nebistinski. The bus remained upright.The man who was killed was hurled through the windshield, he said. His identity was not immediately released.

The bus was carrying about 40 students and adults, Nebistinski said.