Saudi Arabia and Gulf region allies launched military operations including air strikes in Yemen on Thursday, officials said, to counter Iran-allied forces besieging the southern city of Aden where the U.S.-backed Yemeni president had taken refuge.

Gulf broadcaster al-Arabiya TV reported that the kingdom was contributing as many as 150,000 troops and 100 warplanes to the operations and that Egypt, Jordan, Sudan and Pakistan were ready to take part in a ground offensive in Yemen.

There was no immediate confirmation of those figures from Riyadh. Al-Arabiya also said planes from Egypt, Morocco, Jordan, Sudan, Kuwait, the United Arab Emirates, Qatar and Bahrain were taking part in the operation. […]