The Yemeni Air Force was used extensively against the Houthi insurgency in Yemen. The Yemeni Air Force was proven effective in destroying enemy positions and buildings. Most enemy casualties were attributed to air raids. A number of accidents did occur, including one in which a fighter plane accidentally fired a missile and killed more than 80 civilians. During Operation Scorched Earth on 2 and 5 October and 8 November 2009, three fighter jets reported as a MiG-21 and two Su-22 respectively crashed during military missions. The government claimed the crashes were due to technical malfunctions, while the rebels claimed they shot them down with MANPADS. In 2006, F-5Es, MIG 21s and Su-22s repeatedly bombed Houthi positions all over Saada.