The bus was on its way to Karnal from Yamunanagar when it collided with the canter, killing 12 people, including three women and one child, and injuring 11 others.
The injured were admitted to Loknayak Jaiprakash Hospital in Kurukshetra from where three of them, including a five-year old boy, have been referred to PGIMER, Chandigarh, officials said.
Further details are awaited.