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. Last Updated: 07/27/2016

U.S. Tightens Air Rules

SEOUL () -- The U.S. military said Friday it has tightened flying regulations along Korea's demilitarized zone as a result of the downing of a U.S. Army helicopter in North Korean airspace.

The military also said it no longer believes the helicopter's pilots lost their way because snow had covered identifiable features of the land, making navigation difficult. It remains unclear why the aircraft strayed.

The new measures include a retraining of pilots, better navigational systems on helicopters and a higher level of approval needed for flights along the zone, the world's most heavily armed border.

The co-pilot was killed when the helicopter went down Dec. 17 while the pilot was captured and held in North Korea for 13 days.