The BSF seized a consignment of 27kg heroin, worth Rs 135 crore on the black market, after its troopers challenged drug smugglers along the border and forced them to flee without the contraband on Tuesday in Punjab's Abohar sector. br br This was the third contraband seizure made by the BSF personnel in the last 22 days. br br The BSF on March 11 and March 26 had seized 41kg of heroin worth Rs 205 crore and seven kg worth Rs 35 crore, respectively.