By Mubasher Bukhari LAHORE, Pakistan (Reuters) – A female journalist was crushed to death by a vehicle carrying former prime minister Imran Khan in an accident in eastern Pakistan on Sunday as he led a convoy along with his supporters towards the capital, party officials and journalists said. The incident prompted Khan to halt the “long march” that he is leading towards Islamabad to pressure the federal government into calling snap elections. His convoy started from the eastern city of Lahore, and is expected to reach Islamabad on Friday. “Shocked & deeply saddened by the terrible accident tha…