Condemning the attack, the organisation also demanded from the Government of Pakistan that Sarabjit should be sent for best available treatment to any country having more advanced medical facilities to save his life.
"The PUCL fears repercussion of this in India and would appeal to the Government of India to issue an advisory to all state governments to ensure protection of Pakistani prisoners in their states so that such incidents are not repeated," a statement said.
She said in case Sarabjit is brain dead, he should be brought back home so that his family can be with him in the last moments of his life.
"We condemn the attack. We are shocked that co-prisoners were allowed into his ward by the Kot Lakhpat jail authorities with bricks and other sharp edged instruments causing serious head injuries.
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"There seems to be connivance of the Jail authorities in this murderous attack on Sarabjit," she said.
Srivastava said both Sarabjit and his family had been waiting for the last 22 years for his return, but they may now never see that day with reports of his condition deteriorating continuously.
"It was a case of mistaken identity with enough evidence showing that the Trial court, Lahore High Court and the Supreme Court of Pakistan refused to enquire into the grey areas of the case.
Sarabjit, 49, sustained several injuries, including a skull fracture, when six prisoners attacked him in Kot Lakhpat Jail on Friday afternoon.
He was convicted of alleged involvement in a string of bomb attacks in Punjab province that killed 14 people in 1990.