GENEVA (Reuters) - The Saudi-led coalition has intensified air strikes on the Yemeni port of Hodeidah, possibly trapping civilians and hampering a humanitarian operation to import vital food and fuel supplies, the United Nations said on Friday.

Earlier this week, Yemeni government forces backed by Gulf Arab troops recaptured control of the Red Sea city of al-Mokha in a push that paved the way for an advance on Hodeidah, the country's main port city.