The civil war in Libya took a significant turn Saturday when a fighter jet fell from the sky and burst into flames as explosions rang out in the rebel stronghold of Benghazi. A day earlier, the government said it was abiding by a cease-fire and no-fly zone, but witnesses have said violence from forces loyal to ruler Moammar Gadhafi has continued. It was not immediately clear whom the jet belonged to, but the development indicates pro-Gadhafi forces may have moved in on the city considered an opposition stronghold. The opposition has been pushed back from other cities, but has vowed to defend Benghazi to the death.