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.

Tedros Adhanom Ghebreyesus said a member of the plane’s crew was injured and that he and U.N. colleagues were safe. Israel said it targeted Houthi militant infrastructure.