A United Arab Emirates fighter plane taking part in Saudi-led coalition fighting in Yemen is missing, the UAE armed forces said in a statement on Monday.
The armed forces said in a short statement that the jet taking part in the fighting was "lost".
Riyadh and a coalition of Arab states entered Yemen's civil war a year ago, in an attempt to restore President Abd-Rabbu Mansour Hadi after Houthi rebels and forces loyal to former president Ali Abdullah Saleh ousted him from power.
At least two jets from the alliance have crashed since the start of the campaign.
In May 2015 a Moroccan F-16 warplane crashed while on a mission with the alliance in Yemen, and the Houthi militia said tribesmen had shot down the aircraft.
In December that year a Bahraini F-16 jet from the coalition crashed in Yemen's neighbour, Saudi Arabia, after suffering from a technical fault.