Four people — a police officer and three members of his family — were killed and one passerby was injured in a gun attack in Quetta's Nawan Killi area Wednesday evening, DawnNews reported.

Deputy Inspector General (DIG) Abdul Razzaq Cheema told Dawn.com that armed men sprayed bullets on the vehicle of acting Superintendent of Police (SP) Muhammad Ilyas. The officer, his wife, son and granddaughter were killed in the attack.

One passerby was also injured in the attack. Rescue officials said the injured has been shifted to the trauma centre of the Civil Hospital in Quetta.

Cheema said the assailants sped away on their motorcycle after the attack. Police and personnel of Frontier Corps (FC) reached the spot soon after the attack and started investigating.

The police has recently been under attack in the provincial capital. A DIG and two others were killed in a blast in the city last week.