In a new video, al-Qaida's branch in Yemen has threatened to escalate attacks against forces recruited by the United Arab Emirates, which is part of the Saudi-led coalition against the Yemen's Shiite rebels, known as Houthis.

The video obtained Thursday, titled "deterring aggression," accused the UAE of waging an "immoral war" in which its warplanes undertake airstrikes under the banner of fighting terrorism while allegedly slaying civilians.

The UAE has recently formed a new force in southern Yemen dubbed the "Security Belt" led by the ultraconservative Salafists. With better armaments and financing compared to regular army units, it carries out raids and arrests among suspected al-Qaida militants.

The video showed militants marching through the southern city of Aden, training in mountainous areas, and suicide bombers preparing attacks against recruitment camps.