The Coalition Command for Support for Legitimacy in Yemen announced that a number of sites in Aden of the Yemeni army, coalition forces and Palace Hotel were exposed this morning to attacks with Katyusha rockets which resulted in the martyrdom of three members of the force of United Arab Emirates (UAE) participating in the coalition and a member of the Saudi force, and it was dealt with the source of the fire immediately; the launching vehicles were destroyed, and an investigation is still under way to uncover the circumstances of the incident.