Bangalore: Four persons died and more than 15 others were injured when a private bus turned turtle at Hoskote near Bangalore early this morning. There were nearly 50 passengers inside the bus. The bus was coming to Bangalore from Tirupathi. The number of injured has gone up to nineteen, out of which the condition of two passengers are critical. The injured passengers have been admitted to MVJ Hospital. The bus KA-01AA-7709 belonged to Rajesh Travels, and fell into a roadside ditch at around 5:30 am. There were 49 passengers who were returning to Bangalore from Tirupathi. The bus had left Tirupathi at around 11:30 pm. Preliminary inquiries revealed that the driver became sleepy, lost control over the bus, which dashed into a road divider and fell into a roadside ditch.