The Saudi-led coalition intervened in Aden on Sunday in support of the Yemeni government after southern separatists effectively took over the port city, fracturing the alliance that had been battling the Iran-aligned Houthi movement. The infighting, which broke out on Aug. 8 to control the port city which serves as temporary seat of Yemen's Saudi-backed, internationally-recognized government, has killed 40 people and injured 260, the United Nations said. "It is heart-breaking that during Eid al-Adha (the Muslim holiday) families are mourning the death of their loved ones instead of celebrating together in peace," said Lise Grande, the U.N. Humanitarian Coordinator in Yemen.