 While Allied forces explained the causes of violations as navigation errors, equipment failure, weather conditions, and pilots' errors, in Switzerland fear was expressed that some neutrality violations were intended to exert pressure on the country to end its economic cooperation with Nazi Germany.In addition to bombing raids, air attacks by individual fighter planes strafed Swiss targets toward the end of the war.The Swiss military, in turn, attacked Allied aircraft overflying Switzerland with fighters and anti-aircraft cannons.