US, Moroccan and other partner forces have launched coordinated search-and-rescue operations including ground, air, and maritime assets, to find the service members who went missing near the training site of Cap Draa, the two militaries said in separate statements.

The Moroccan army said the service members went missing near a cliff.

The incident remains under investigation and the search is ongoing, they added.

African Lion is the US Africa Command’s largest annual joint exercise, aimed at improving interoperability among US forces, Nato Allies and African partner nations.

This year’s edition runs from April 27 to May 8 across the four nations of Ghana, Morocco, Senegal and Tunisia.

The largest part of the drills takes place in Morocco involving approximately 5,000 personnel from over 40 countries, according to AFRICOM.