AlHijjah 18, 1434, Oct 23, 2013, SPA -- The Swiss military says that an F/A-18 fighter jet has crashed in central Switzerland, and the fate of its two crew members is unknown. According to AP, authorities say the crash happened near a military airport in Alpnachstad in the Lake Lucerne region. The Swiss Defense Department says the cause of the crash remains unknown. A helicopter and emergency services were deployed at the crash site. A nearby railway line and road were closed.