BANGKOK, Thailand (AP) _ A bus driver who may have fallen asleep at the wheel drove off a road in Thailand and hit a tree, killing himself and 14 passengers and injuring 25 others early Tuesday, authorities said.

The bus was traveling from Bangkok to the town of Lumsak at night when it crashed into a tree by the road 185 miles north of the capital. Local police said there was no sign that the driver tried to brake, suggesting he fell asleep.

All those killed were Thais.