Security forces fired rockets in two clashes with tribal insurgents in Balochistan on Wednesday but there were no casualties, officials said. In one encounter rebels blew up a well at a gasfield in Sui, near the town of Dera Bugti, security officials said. Security forces fired rockets at suspected rebel outposts but no one was killed or injured, one official said. Rebel sources also said there were no casualties. Separately, troops and insurgents exchanged at least eight rockets each plus light weapons fire at nearby Sangseela town, again with no casualties, the official said. Militants also exploded bombs attached to three legs of an electricity pylon near Quetta. Another bomb attached to the fourth leg failed to go off and the main supply line was not damaged, officials said. On Tuesday thousands of people were left without gas after a key pipeline in Balochistan was blown up, and two others were targeted on Monday.