The U.S. Coast Guard searched Friday for two Marine helicopters that collided with 12 people on board near the Hawaiian island of Oahu.
Search conditions were challenging because of darkness and high surf, Coast Guard Chief Petty Officer Sara Mooers told Los Angeles radio station KNX-AM. She said a high surf advisory was in effect for waves 10 to 15 feet building throughout the morning.
Coast Guard District 14 told CBS News the debris field included an empty life raft and fire on the water.
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