Yemeni forces claim fresh advances across key fronts as cross-border Houthi attacks surge amid heavy clashes. Members of the Saudi-backed Yemeni government forces react during what they say to be clashes with Yemen's Iran-aligned Houthis in a location given as near Al-Hazm, Yemen, in this screen grab. The Bundibugyo strain has spread to Kenya and Uganda, while two in Nigeria returned negative results.