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By Ayman al-Warfalli BENGHAZI Libya (Reuters) - Libyan forces on Tuesday battled Islamist militants with rockets and warplanes for control of an army base in the eastern city of Benghazi after at least 30 people were killed in overnight fighting. Intense fighting in Benghazi, Libya's second city, and battles between rival militias in the capital Tripoli have pushed Libya deeper into chaos after two weeks of the fiercest violence since the 2011 civil war ousted Muammar Gaddafi. A rocket hit a fuel depot near Tripoli airport two days ago, igniting a huge blaze that Libyan fire-fighters on Tuesday were fighting to put out. Italy's government and Italian oil group ENI had agreed to help them, the government said.