"We are concerned at the condition of Sarabjit Singh indicated by reports made available by doctors treating him in Jinnah Hospital (in Lahore).
"Our High Commissioner has met the Pakistan Foreign Secretary and urged the Pakistan government to immediately release him on humanitarian and sympathetic grounds so that he can benefit from the best available treatment in India," the Spokesperson in the Ministry of External Affairs Ministry said.
"This is not the time for invoking legal and bureaucratic reasons for not taking the right steps to save a human life. We believe that every endeavour should be made to save his life," the spokesperson said.
Earlier, sources in Lahore told PTI that the Indian death row convict has slipped into a "non-reversible" coma and doctors were struggling to save his life. The deterioration in his condition could lead to "brain death", they said.
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"I will tell the Prime Minister with folded hands that I have doubts about the treatment being given to Sarabjit in Pakistan," Sarabjit's sister Dalbir Kaur told reporters.
Sarabjit sustained several injuries, including a skull fracture, when six prisoners attacked him in the jail. He was hit on the head with bricks and his neck and torso cut with sharp weapons.
The outgoing Pakistan People's Party-led government put off Sarabjit's execution for an indefinite period in 2008. His family says he is a victim of mistaken identity and had inadvertently strayed across the border in an inebriated state.