Amid tight security, the eighth batch of over 5,700 pilgrims left from here on Thursday for the twin base camps of 3,880-metre-high cave shrine of Amarnath in south Kashmir Himalayas, officials said. A total of 5,726 pilgrims left the Bhagwati Nagar Yatri Niwas here in a convoy of 242 vehicles amid heavy security of the Central Reserve Police Force (CRPF), they said.