Fires burn on the runway of Tripoli International Airport Tuesday as Libyan militia fighters transform it into a battlefield.<br/> <br />Two days of fighting between rival militias has knocked out the airport's control tower and wrecked 11 civilian planes.<br/> <br />The main terminal building has been turned into a field hospital.<br/> <br />It's been three years since the uprising that toppled dictator Muammar Gaddafi.<br/> <br />The new government is struggling to impose order in a country whose economy is in tatters.<br/> <br />At least 15 people have been killed in the capital and the eastern city of Benghazi since Sunday.<br/> <br />The violence has prompted the United Nations to evacuate its staff from the country.
