JACOBABAD: A big explosion occurred at the oil depot of Shahbaz airbase here Sunday. Police rounded up several people on suspicion. According to details an explosion occurred at oil depot of Shahbaz Air base here today. It was heard at distance. It caused severe fear and panic among the people. Police and other law enforcement agencies rushed to the scene and sealed the area. Several suspects were taken into custody. No detail of explosion could be known. Strict security measures were adopted following explosion at oil depot of Shahbaz Airbase. Helicopters’ flights were increased.