* Total, Exxon and others have projects in Mozambique * Mozambique was hoping to rival Qatar and Australian LNG PARIS, April 26 (Reuters) - French energy group Total declared force majeure on its $20 billion liquefied natural gas (LNG) project in Mozambique and confirmed it had withdrawn all staff from the construction site following insurgent attacks last month. Dozens of civilians were killed in the Islamic State-linked attacks in the coastal Mozambique town of Palma, near gas projects that are worth $60 billion and are aimed at transforming the East African nation's economy. The violence in March has dealt a blow to plans by Total and