Israel has severely weakened Hamas and Hezbollah. Now it's going after another member of Iran's so-called axis of resistance: the Houthi rebels of Yemen.

World Health Organization chief Tedros Adhanom Ghebreyesus was about to board a plane at the Sanaa International Airport when it came under attack. A crew member on the plane was injured, he said.

The assault killed at least four people and injured 21 others, the state news agency in Yemen reported. The strikes came after a week of attacks by the Iran-backed militia.