The head of the World Health Organization said on Friday he was not sure he was going to survive an air strike on Yemen's main airport carried out by Israel a day earlier during a series of attacks on the Iran-aligned Houthi movement.

The United States said it struck targets in Yemen's rebel-held capital in December, hours after a Huthi rebel missile wounded people in Israel. But a nighttime picture of a massive fire repeatedly shared on social media does not show the US strike.