More than 122 people were killed and 99 injured when a trailer-truck carrying dynamite to a stone quarry overturned and exploded an hour after a crowd gathered to look at the accident, police said Saturday.

The blast in southern Phang Nga province Friday evening also destroyed about 50 homes, said Sgt. Somkit Manjan of the provincial police.He said rescue workers balked at searching for further bodies in the dark Friday night, when police estimated the death toll at about 40. Rescuers feared another explosion, he said. Search resumed at daybreak and additional bodies were found.

Prime Minister Chatichai Choonhavan arranged to visit the area Saturday to direct relief efforts, his spokesman said.

Phang Nga is a tourist attraction, known for its spectacular greenery and beaches stretching out to the Andaman Sea.

The truck overturned rounding a bend in the coastal district of Thai Muang, about 400 miles south of Bangkok, police said.