"Pakistani establishment has been hijacked by terrorists. Pakistan government runs at their whims and mercy. The attack on Sarabjit is unfortunate.
"It is more unfortunate since his sister had written to the government warning about threat to Sarabjit's life in Pakistani jail," party Vice President Mukhtar Abbas Naqvi said.
Ruing that "despite the written warning, Indian government did nothing," the BJP leader said "India should take strong note and warn Pakistan".
Sarabjit Singh was today attacked and seriously injured on the head by two prisoners in Lahore jail.
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The attack occurred when Singh and other prisoners were brought out of their cells for an hour-long break.
Foreign Office spokesman of Pakistan Aizaz Ahmad Chaudhry told the media that officials of Kot Lakhpat Jail were probing the incident.
Chaudhry said the Foreign Office was examining a request from the Indian High Commission seeking consular access to Sarabjit.