Cliffs, jungle a big hurdle for feds in Hawaii copter crash

This Dec. 17 aerial photo shows the Na Pali Coast on the island of Kauai in Hawaii. (AP Photo/Maryclaire Dale)

HONOLULU — The remote and rugged terrain on the Hawaiian island of Kauai where a sightseeing helicopter crashed, killing all seven people aboard, could make it difficult or even impossible to piece together what led to the wreck.