QUETTA: At least four police personnel were martyred and 17 others injured on Tuesday when a power explosion rocked Quetta's Zarghoon road near the Balochistan Assembly building. 

The explosion took place near a police truck parked close to GPO Chowk on Zarghoon Road, located in the city's high-security Red Zone, around 300 metres from the provincial assembly building.

DC Quetta Farrukh Ateeq confirmed that a police vehicle was targeted in the blast. However, he said he could not confirm the number of wounded persons.

Sources said security personnel were on their way back upon completion of routine duty when the explosion took place. 

Geo News correspondent Salman Ashraf was reporting from near the spot when the loud explosion was heard. 

Police personnel took positions around the provincial assembly building, while additional contingents were also called in following the blast.

Security officials said a bomb disposal team was also present at the location conducting necessary search and sweep exercise and examining the nature of blast.

?This is a developing story and will be updated as further reports are received