Prime Minister Narendra Modi has expressed grief on the tragic demise of Sikh Pilgrims in Pakistan.<br />''<br />'' In a tweet, Mr Modi said, his thoughts are with their families and friends in this hour of grief.<br />''<br />''The Prime Minister prayed that those pilgrims injured recover at the earliest.<br />'' <br />''Nineteen Sikh pilgrims were killed in an accident in Punjab province of Pakistan after their vehicle rammed into a train today.