Famed politician and Pakistani cricket star Imran Khan suffered spinal fractures and a head injury after a dramatic fall on the campaign trail, officials said. Khan is one of two frontrunners for Pakistani prime minister. He was injured Tuesday just four days before the country's historic election -- Pakistan's first democratic transition of power. Khan and at least two guards were riding on a forklift up to a stage in Lahore, where Khan was to hold a rally. The men apparently lost their balance near the side of the stage and fell about 20 feet, clinging on to one another, according to a report of CNN. Khan struck his head on a metal bar jutting out of machinery on the way down. His guards were not seriously injured. A doctor at Shaukat Khanum Hospital told reporters that Khan suffered two fractures to his spine and needs to rest, but there's no sign of any neurological damage. From his hospital bed, Khan urged citizens to vote in Saturday's election. His injuries cut short a grueling schedule of 50 rallies across Pakistan in eight days. His main opponent, Nawaz Sharif, decided to postpone campaigning out of respect of Khan.