At least four people were killed and more than 20 injured in a road accident in Gumla district of Jharkhand on Tuesday, police said.According to the police, a bus carrying more than 25 people met with an accident at Kulmunda village."While negotiating a blind turn, the driver lost control of the bus and hit a roadside tree," said an official. The driver, two women and one child died on the spot. The injured have been admitted in a local hospital, and a few of them are said to be in critical condition.