Ancient walls of Awarta, West Bank

With the Saudi-led military coalition in Yemen launching a major offensive on the rebel-held port of Hodeidah, aid groups are warning of a humanitarian disaster on a scale far outstripping that already seen. Yemen is already considered the world's worst humanitarian crisis, with 10.4 million people at risk of famine. Hodeidah is the entry point for 70% of the aid upon which over 22 million Yemenis depend.  The UN Office for the Coordination of Humanitarian Affairs warned that a sustained battle or siege of Hodeidah could lead to the deaths of as many as 250,000 civilians. (Map via University of Texas)