Amid tight security arrangements, the 18th batch of Amarnath pilgrims consisting of 2,646 pilgrims left for Kashmir Valley from Jammu this morning. <br/><br/>According to police sources the batch including 1,913 men, 583 women and 149 Sadhus and Sadhvis left for Kashmir Valley from Bhagwati Nagar Jammu base camp, in a cavalcade of 106 light and heavy vehicles, around 4:30 am this morning.