Sri Lanka, May 2 -- Ten people have been killed and more than 30 injured after a bus hit several vehicles at a toll gate on one of the busiest highways in northern Philippines, authorities say.

The bus driver, who has been detained, said he had fallen asleep at the wheel, police told AFP, adding that four children were among the dead.

Buses on the nearly 100km (62 miles) Subic-Clark-Tarlac Expressway often ferry workers between Manila and surrounding provinces. The accident on Thursday happened while families were travelling for Labour Day.

The Department of Transportation ordered the suspension of Solid North Bus, a major bus operator in the region and the company that owned the vehicle involved in the crash.

The bus driver may be ch...