JMB militants yesterday threatened to blow up Khan Jahan Ali Science and Technology Institute. Principal of the institute Abul Kalam Azad filed a general diary (No. 1360) with Khulna thana at 11 am yesterday seeking security on the campus. According to the GD, Principal Azad received a hand written letter on the afternoon of December 22, sent by post by Moulana Ataur Rahman, who identified himself as the 'second-in-command' of outlawed JMB in Khulna division. The letter said JMB suicide bombers will blow up the institute anytime between December 25 and December 30 for not recasting education in Islamic style.