(AP) — A charter bus veered off Highway 99 before dawn Tuesday and struck a pole that sliced the vehicle nearly in half, killing five people and sending at least five others to hospitals, authorities said.

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The unmarked white bus carrying about 30 people hit the pole of a highway exit sign, and emergency workers climbed in through the windows to pull passengers out.

“The pole went through the center of the bus, and that’s where the injuries were sustained,” California Highway Patrol Officer Moi Onsurez told The Associated Press.

The five injured were airlifted to hospitals, Onsurez said, but he did not have information about any additional injuries or the cause of the single-vehicle crash.

The bus was heading from Southern California to Sacramento on Highway 99 when it crashed around 3:30 a.m. between the cities of Atwater and Livingston, Onsurez said. The freeway cuts through farm fields in the San Joaquin Valley.

Atwater is a city of 28,000 people in Merced County, about 65 miles northwest of Fresno.

The northbound lanes of the freeway were closed during the investigation.