A Belgian boy and a Dutch man were killed and 26 other people injured early Saturday when their tourist bus rolled over on a highway in southwestern France, police said. Authorities in the Herault region said an early investigation indicated that the driver of the Belgian-registered vehicle appeared to have fallen asleep at the wheel. He was being questioned by police. The bus carrying 54 passengers toppled over at around 4:30 a.m. (0230 GMT) on the A9 highway in Bessan, about 10 kilometers (6 miles) from the Mediterranean Sea between the towns of Agde and Beziers. Dozens of rescue workers were quickly deployed to the scene, LCI television reported.