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By Ayman al-Warfalli BENGHAZI, Libya (Reuters) - Libya's internationally recognised government carried out air strikes on Tuesday against Islamic State militants in the eastern city of Derna, a senior commander said. The North African country is in the throes of a power truggle with two governments allied to dozens of armed groups fighting each other four years after the uprising that ousted veteran strongman leader Muammar Gaddafi. While unable to defeat each other on several front lines across the oil-producing state, both governments have also been clashing with Islamic State insurgents exploiting a security vacuum as in Iraq and Syria. Saqer al-Joroushi, air force commander of the official Libyan government based in the east since losing control of Tripoli in August, said his warplanes had hit Islamic State positions in Derna on Monday and Tuesday.