Indian national Sarabjit Singh, condemned to death for his alleged involvement in four bomb blasts in Pakistan in 1990, will be hanged on April 1 in a prison in Lahore [Images].

The death warrant for Sarabjit was received by authorities at Kot Lakhpat jail in Lahore where he has been held for the last 17 years and will be executed on April 1, Urdu newspaper Daily Express reported on Sunday.

The mercy petition of Sarabjit, who Pakistan claims is Manjit Singh, was rejected by President Pervez Musharraf [Images] on March 3.

Sarabjit's mercy petition was sent to Musharraf along with that of Indian prisoner Kashmir Singh, who was freed after spending 35 years on death row in Pakistani jails.

There was no official confirmation of the development.

Sarabjit was sentenced to death for his alleged involvement in bomb blasts in Lahore and Multan that killed about 14 people. His family denies he was a spy as claimed by Pakistan and insists he accidentally strayed into Pakistani territory.

In his mercy petition sent to Musharraf, Sarabjit had sought his release on the grounds that he was innocent and wrongly implicated.

The petition was rejected by the President after 'thorough consideration' as the allegations against him 'were proved and he was awarded capital punishment by court', official sources said.

Pakistan's Supreme Court too had rejected Sarabjit's plea for clemency in March 2006.

Following the rejection of Sarabjit's mercy petition by the President, the interior ministry had informed the government of Punjab province to take steps to carry out his death sentence.