ISLAMABAD - Indian Prime Minister Dr Manmohan Singh Friday expressed deep grief and sorrow over the tragic air crash at Islamabad.  In a message to Prime Minister Syed Yousuf Raza Gilani, the Indian prime minister conveyed his deepest condolences to the families of those who lost their lives in this unfortunate incident. Singh said that he was deeply grieved over the air tragedy that leads to loss of so many precious lives. “I pray that the Almighty will grant them the strength to bear their loss. Our thought and prayers are with the people of Pakistan in this time of grief,” the Indian Prime Minister said.