Two Emirati pilots have been killed after their plane crashed due to a technical failure in Yemen, the General Command of the UAE Armed Forces announced on Tuesday.

Major Pilot Ali Saeed Saif Al Mesmari and First Lieutenant Pilot Bader Yahiya Mohammad Al Marashdeh were part of the Saudi-led Arab coalition’s Operation Restoring Hope in Yemen.

In September last month, another Emirati pilot, Captain Khalid Mohammad Al Shehi, died when his aircraft crashed due to a technical failure. He was also serving as part of Operation Restoring Hope.

A Saudi-led coalition of Arab states began a military campaign two years ago in an attempt to restore President Abd-Rabbu Mansour Hadi and block Houthi rebels from gaining control of Yemen.

The Houthi rebels are loyal to former president Ali Abdullah Saleh.

Earlier this month, UN Secretary-General Antonio Guterres placed the Saudi-led coalition on his annual “list of shame” for violations against children, having documented the Saudi-led coalition, Houthi-Saleh forces, and other parties killing and maiming children among other offenses.