India, May 27 -- Six people, including a police sub-inspector, were killed and 21 others seriously injured when a double-decker AC bus overturned on the Lucknow-Agra Expressway in Uttar Pradesh's Unnao district, police said.

The accident took place at 5.15 am near Nibha Kheda village when the bus, travelling from Delhi to Bihar, went out of control and overturned, they said. Police said around 50 passengers were believed to be travelling in the bus.

According to preliminary investigation, the driver allegedly lost control of the vehicle after dozing off at the wheel. The deceased have been identified as police sub-inspector Ravi Charan Ram (around 50), Suresh Kumar Jaiswal (40) of Gorakhpur, Videshi Gupta (45), Vijay Kumar (24) of Basti...