sentences:  Furthermore, all the approach roads had been laced with Claymore mines or explosives by the Tigers in its years of fighting with the Sri Lankan army.The Tigers also made extensive use of IEDs (improvised explosive devices) which could be remotely detonated from over a kilometer away.During this time Eastern Command of the Indian Navy, supported by the Coast Guard, was key in establishing a long blockade around northern Sri Lanka from October 1987 to disrupt the Tigers' supply and communication routes.