By AHMED AL-HAJ Associated Press

Yemeni troops, backed by Saudi-led airstrikes, battled Shiite rebels Wednesday in neighborhoods they previously controlled in the southern port city of Aden, a day after they pushed them out of the local airport, military officials said.

The offensive, closely coordinated with the Saudi-led coalition, is a serious blow to the Shiite rebels and allied forces who have been trying to seize control of the strategic city since March.

Houthi officials said they were taken by surprise by the new push. A senior military official said the troops involved have been trained in Saudi Arabia, a program that began about two months ago. He said the troops also received new equipment, including armored vehicles.

The official said fighting intensified Wednesday in Crater and Mualla, neighborhoods that house the presidential palace, government offices and ports.

The official spoke on condition of anonymity to discuss ongoing military operations.

The Saudi-led coalition has been targeting the Iran-allied Houthis and their allies since March in a bid to stop their power grab across Yemen.

The strikes and ground fighting came despite a U.N.-brokered truce — which is due to expire Thursday at the end of Ramadan.

On Wednesday, U.N. humanitarian chief Stephen O'Brien called again for an immediate and unconditional humanitarian pause in Yemen. O'Brien said despite the fighting, humanitarian workers have been able to distribute some aid but "it is not nearly enough and we need access and funds to rapidly scale up critical humanitarian supplies and services."

U.N. spokesman Stephane Dujarric said the appeal for $1.6 billion for Yemen for humanitarian assistance this year has only been 15-percent funded.

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Associated Press writer Edith Lederer at the United Nations contributed to this report.