UNB, Mymensingh :Three people were killed and four others injured in a collision between a bus and a CNG-run auto-rickshaw on Mymensingh-Sherpur highway at Dholibazar in Phulpur upazila on Sunday.The deceased could not be identified immediately.The accident took place when the Sherpur-bound bus collided with the CNG- run auto-rickshaw coming from opposite direction around 1:30pm, leaving seven passengers of the auto-rickshaw injured, said Abdul Motaleb, officer-in-charge of Phulpur police station. Later, the injured were taken to Upazila Health Complex where the trio succumbed to their injuries.