LAUSANNE, Switzerland - Iran and six world powers tried to break an impasse in nuclear negotiations, but officials cautioned that attempts to reach a preliminary deal by a deadline in two days could yet fall apart. Full Article | Video
ADEN - Yemeni fighters loyal to the Saudi-backed President Abd-Rabbu Mansour Hadi clashed with Iranian-allied Houthi fighters on Sunday in Aden, the absent leader's last major foothold in the country. | Video
Air Canada says Transportation Safety Board of Canada is investigating Air Canada flight sliding off Halifax runway, injuring passengers. Rough Cut (no reporter narration).