The accident took place at 5:50 p.m. local time (13:50 GMT) not far from Jebel Jais Mountain in the country's emirate of Ras Al Khaimah, the Emirates News Agency (WAM) reported.
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Two pilots, a navigator and a first aid man were killed in the crash, the agency cited the National Search and Rescue Center as saying.
The UAE authorities have launched a probe into the air disaster.