Three doctors from New Delhi’s All India Institute of Medical Sciences were killed and four were injured after their car rammed into a truck on the Yamuna Expressway on Sunday morning. The doctors were travelling from New Delhi to Agra when their car tried to overtake the mini-truck near Mathura.

The police identified the deceased as doctors Yashpreet Singh, Harshad Wankhade and Hembala, according to India Today. Their bodies were sent for an autopsy. The four injured doctors – Catherin Halam, Mahesh Kumar, Dr Jitender Mourya, and Abhinava Singh – were taken to a private hospital for treatment.

“The accident occurred at around 2.30 am, when the group of doctors were heading Agra to celebrate their senior colleague Dr Harshad Wankhade’s birthday,” Deputy Superintendent of Police Vijay Shankar Mishra told The Times of India. “It was Dr Harshad who was driving the Toyota Innova. The speeding car rammed into the rear of a truck.”

The driver of the mini-truck fled after the accident, the police said. The truck had a Uttar Pradesh registration number, NDTV quoted the police as saying.

In another accident in the early hours of Sunday, two people were killed and 22 were injured when a state-run bus fell off the Yamuna Expressway near Pari Chowk in Uttar Pradesh’s Greater Noida, the Hindustan Times reported. The police suspect the driver had dozed off when the bus veered off the road, hit a road divider and fell into an underpass cabin.

“Most of the passengers were asleep, but I was awake,” National Security Guard commando Yogender Singh, who was on the bus, said. “Almost all of them were jolted awake when they felt a lot of jerks when the bus ran over the divider. By the time I shouted to alert the driver, who had probably dozed off, the bus had already fallen off into the underpass cabin on the right side of the road.”