The officials said the overnight attack hit the men's vehicle as they were travelling near the town of Haban.
The officials also said that in the onetime al-Qaida stronghold of Mukalla, on Yemen's southern coast, troops from the United Arab Emirates and others in the Saudi-led coalition who are primarily fighting Yemen's anti-government Shiite rebels conducted raids on homes seeking al-Qaida operatives.
They say some 150 suspects were detained. Activists close to al-Qaeda said the men were being tortured in prisons run by Emirati forces. The officials spoke on condition of anonymity because they were not authorised to talk to reporters, while activists did so for fear of reprisals.
The statement did not say where the helicopter crashed or offer any details on the type of helicopter involved.
A day earlier, the UAE had announced that an Emirati pilot and co-pilot died "during a routine flight over international waters." A statement on the Saudi Press Agency later said the two were part of the coalition fighting in Yemen.
