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As a result of the explosion, three persons were killed on the spot and 18 others including OGDC employees and citizens suffered serious injuries, they maintained.
The dead were identified as Nizamuddin and Muhammad Ishaq while the injured included Kamran, Muhammad Nawaz, Samiullah, Muhammad Ilyas, Mehtab Khan, Shahid, Nazar Muhammad, Muhammad Deen, Zahoor Ahmed, Shabbir Ahmed, Haji Khan and Naimatullah.
The injured have been shifted to hospitals in Sibi and Larkana. The Law enforcement agencies and police led by Acting DPO Naseerabad Javed Shah reached the place soon after the incident and cordoned off the area to arrest the suspects.
Meanwhile, the police have taken 70 suspects into custody and interrogating them.