A shuttle bus carrying Apple employees from San Francisco to Cupertino caught fire this morning in unincorporated San Mateo County near Menlo Park, a California Highway Patrol spokesman said.

The fire was reported at 6:40 a.m. on southbound Interstate Highway 280 at Sand Hill Road, CHP Officer Art Montiel said.

The rear left side of the bus caught fire. Montiel did not know what caused the fire.

No one was injured. Two lanes of the highway were closed for more than an hour and reopened at about 8 a.m.

No other vehicle was involved in the incident, Montiel said.

The employees were transferred to a different bus following the fire.

NBC Bay Area chopper video showed firefighters hosing down the bus, while traffic was diverted. All southbound lanes were reopened around 8 a.m.

There were approximately 15 people inside the bus, per eyewitness information.

