 A United Nations panel of human rights investigators reported that the Syrian government used thermobaric bombs against the rebellious town of Qusayr in March 2013.Russia and Syrian government are using thermobaric bombs and other thermobaric munitions during the Syrian Civil War against insurgents and insurgent held civilian areas.Thermobaric and fuel–air explosives have been used in guerrilla warfare since the 1983 Beirut barracks bombing in Lebanon, which used a gas-enhanced explosive mechanism, probably propane, butane or acetylene.