In Yemen, Houthi rebels have claimed responsibility for a drone attack on a Saudi state oil company refinery in Riyadh. But the oil company, Saudi Aramco, said a fire at the refinery was due to “an operational incident.” This comes as Houthi leader Abdul-Malik al-Houthi indicated that rebels are prepared to hand over the crucial port of Hodeidah to the United Nations if the U.S.-backed, Saudi-led coalition stops military operations there, which have forced tens of thousands of civilians to flee. The U.N. has warned the offensive may severely exacerbate the ongoing humanitarian crisis in Yemen, which is already experiencing the world’s worst cholera epidemic, with more than a million people afflicted, and with millions more on the brink of famine.