Singh had been threatened after Afzal Guru was executed in India in February 2013 over his role in the 2001 Indian Parliament attack case . Some sources had indicated that the attack was planned after Guru 's execution . The Indian prime minister , Manmohan Singh , termed the attack as " very sad " . On 29 April 2013 , India appealed to Pakistan to release Sarabjit Singh on humanitarian grounds or at least allow him to be provided medical treatment in India , but these were repeatedly rejected by Pakistan . Appeals by lawyers were also filed with the Supreme Court of Pakistan to send Singh for medical treatment to the UK or outside Pakistan to save his life
2001 Indian Parliament attack
2001 Indian Parliament attack
Sarabjit Singh