In the first incident, three brothers, Varun Kumar, Lamit Kumar and Aditya Kumar were killed in a car-truck collision at Radour, police said.
The trio were travelling from Jagadhri. While, Lambit and Varun were going to Ferozepur to join their duty as doctors, they were to drop their brother Aditya, an engineer, at Kurukshetra, they said.
The truck driver fled the from spot along with his vehicle after the accident, they said, adding, the bodies of the brothers were handed over to relatives after postmortem.
Another youth who was riding the bike with them was seriously injured in the accident and has been referred to PGIMER at Chandigarh.