The fighting between the Iran-backed Houthi militia and Saudi-backed government forces has exacerbated one of the world’s worst humanitarian crises, the World Health Organization said.

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The grand mufti urged Saudi-led forces to remain in “constant readiness,” suggesting that the kingdom might expand its campaign against the Houthis in Yemen.

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Attacks on Saudi cities on the Red Sea by the Iran-backed Houthi militia in Yemen have added to pressure on global oil supplies.

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The Iran-backed militia in Yemen fired six ballistic missiles at Saudi cities, a military spokesman said. It was a major cross-border attack.

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