An undated file picture shows a Swiss Air Force twin seater Boeing F/A-18D Hornet fighter plane. A F/A-18 twin seater of the Swiss Airforce crashed in a mountain near Alpnachstad in central ... more 
An undated file picture shows a Swiss Air Force twin seater Boeing F/A-18D Hornet fighter plane. A F/A-18 twin seater of the Swiss Airforce crashed in a mountain near Alpnachstad in central Switzerland October 23, 2013, the Swiss Defence ministry confirmed. Two pilots are still missing. REUTERS/Swiss Air force/Handout/file (SWITZERLAND - Tags: MILITARY DISASTER) less 
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Reuters | Photo By HANDOUT / REUTERS
Wed, Oct 23, 2013 10:33 AM EDT