Indian national Sarabjit Singh, on death row for his alleged involvement in four bomb blasts in Pakistan, has sent a mercy petition to President Pervez Musharraf, seeking release on the grounds that he is “innocent and wrongly implicated”. The petition was sent to Musharraf last week both by post and through the high-security jail authorities where Singh is currently imprisoned. He has begged pardon under the powers granted to the president by the Constitution, Singh’s lawyer Rana Abdul Hameed told the Press Trust of India on Saturday. Hamid, who has been hired by a Canadian human rights group to defend Singh, said from Lahore over the phone that the mercy petition was filed after the Supreme Court last month dismissed his application, seeking a review of the death sentence given to him in a bomb blast case at Yakki Gate in Lahore in 1990. Three people were killed and several injured in that bombing. The Supreme Court is yet to give its verdict on another case against Singh in which he was accused of committing three more bomb blasts in Punjab. Fourteen people were killed in the four bomb blasts in which Singh is accused of involvement. Police allege that he was an Indian spy and entered Pakistan through the Punjab border.