TEHRAN, June 10 (Xinhua) -- A number of explosions were heard early Wednesday and air defenses were activated in the port city of Bandar Abbas, Qeshm Island, Sirik County and Jask County in southern Iran, state-run IRIB TV reported, citing sources. The semi-official Tasnim news agency reported that six explosions were heard in Sirik, Qeshm Island and the southern city of Minab, adding that areas in the three regi