At least 22 people were killed and 24 others injured Friday when a bus packed with passengers crashed in eastern Thailand, police said. The bus was traveling down a steep road with numerous curves when the vehicle slammed into a hillside in Prachinburi province, said police official.  "Initial investigation shows that the bus might have had a break failure and could not stop on the steep road,'' he said. The death toll was expected to increase since a number of the injuries were severe, the police officer said.