A rescue helicopter crashed on Saturday in the emirate of Ras Al-Khaimah, killing all crew members, according to the United Arab Emirates state news agency WAM.
Sheikh Saud bin Saqr al-Qasimi, ruler of Ras Al-Khaimah, ordered an investigation into the incident that took place at 5:50 pm (1350 GMT).
"The General Civil Aviation Authority announced the crash of an Agusta 139 helicopter during a rescue mission in Jebel Jais in Ras al-Khaimah," said the report.
It was not immediately clear how many crew members were on board. The UAE comprises the emirates of Abu Dhabi, Ajman, Dubai, Fujairah, Ras al-Khaimah, Sharjah and Umm al-Qaiwain.