Imphal, Dec. 10: Following the bomb blast yesterday evening at Singjamei Mayengbam Leikai in which 6 persons including an 18 month infant sustained serious injuries, residents of the locality including Meira Paibis and representatives from clubs staged a sit-in protest at Mayengbam Leikai demanding stern and exemplary punishment of the culprit while denouncing such thoughtless and inconsiderate actions of planting and blasting bombs in public places.