The latest round of strikes occurred as the United States and its ally Israel struggle to halt a campaign of regional assaults by Yemen’s Houthi militants.

Israeli forces unleashed a series of strikes on the Yemeni capital Sanaa and the western city of Hodeidah on Thursday, killing at least six people and injuring dozens more, the Houthi militant group said in a statement.

A wave of Israeli airstrikes hit Yemen's main airport Thursday just as the World Health Organization’s director-general said he was about to board a flight there. One of the U.N. plane’s crew was wounded,