Unfazed by Monday’s terror assault wherein seven pilgrims have been killed, about 22,000 pilgrims set off on Tuesday amid tight safety for the Amarnath cave shrine in south Kashmir.Chanting Bam bam Bhole, three,289 pilgrims, 756 of them ladies, started the arduous trek each from the traditional Pahalgam route and the shorter Baltal route from Jammu, an official spokesman stated.By 10.30 am, 18,838 pilgrims had left for the shrine within the Himalayas from Chandanwari, Sheshnag, Panjtarni and Baltal camps.