At least 29 people were killed when a bus rammed into a truck in Pakistan's south Sukkur district Tuesday, police said.At least 25 people were hurt in the accident at Thehri bypass of Sukkur, the third largest district of the country's south Sindh province, reported Xinhua.Army and troopers have rushed to the site. Police said the accident occurred as the bus driver lost control due to over speeding.The bus caught fire after colliding with the truck as its gas cylinder exploded.