QUETTA-Two people were killed and two others sustained critical wounds in a landmine blast that occurred in Rabi Canal area of district Nasirabad on Thursday morning, police said. While a gas pipeline was also blown up in district Dera Bugti. According to police sources, unknown people had laid a landmine near Rind Camp, a densely populated locality of Nasirabad which exploded with a big bang killing two persons identified as Nawab Khan and Bakhshu on the spot and leaving two others with critical wounds. The injured were identified as Muhammad Khan and Ahmad Ali. They were shifted to the hospital. Police and other law enforcement agencies reached the blast site shortly after the incident. Meanwhile, a pipeline supplying gas to Sui purification plant from well no 81 was blown up in Dera Bugti. The sources, said that unknown armed men had fitted explosive device with a gas pipeline that exploded and destroyed a portion of pipeline suspending gas supply to Sui purification plant. Police has registered cases of both incident against unknown persons and started investigations. Meanwhile, unknown armed motorcyclists hurled a hand grenade on a house owned by Nasir Ahmad Khan at Samungli Road. The hand grenade hit the wall and fell on the road with a huge explosion smashing windowpanes of the nearby buildings. However, no loss of life was reported in the blast.