Four people were killed when a tour bus carrying government employees collided with a truck along the Subic Clark Tarlac Expressway (SCTEx) on Thursday.

The northbound tourist bus carrying government employees was moving fast when it crashed into the truck in the Concepcion, Tarlac area, said Robin Ignacio, traffic management and safety head of the adjoining North Luzon Expressway (NLEX).

Almost all 50 bus passengers were hurt, he told radio DZMM.

The fatalities succumbed to their injuries at the Concepcion District Hospital in Tarlac.

Investigators were still looking into whether the bus driver fell asleep or miscalculated his speed before the accident, said Ignacio.

TINGNAN: Salpukan ng trak at bus sa SCTEX sa bahagi ng Concepcion, Tarlac nitong Huwebes ng umaga. (Photos courtesy of Joseph Macalino) pic.twitter.com/aY5GGWJhwp

— ABS-CBN News (@ABSCBNNews) January 31, 2019

DZMM, 31 January 2019 ​