Dozens were killed in overnight clashes in Yemen as Iran-backed Houthi rebels intensified attacks to seize the government's last northern stronghold, officials said Sunday.
Yemen has been embroiled in a bloody power struggle since 2014 between its government, supported by Saudi Arabia, and Houthi rebels, who control the capital Sanaa and most of the north.
The rebels have also escalated attacks against Saudi Arabia, drawing condemnation from the international community.