Yemeni security officials say the Saudi-led coalition has launched fresh airstrikes on Shiite rebels in two cities, a day after the kingdom declared an end to its month-long campaign targeting the Iran-backed rebels and their allies.

They say Wednesday's airstrikes hit the central city of Taiz, where the rebels, known, as Houthis, had gathered at a military headquarters they control near the old airport to the city's southeast.

Air strikes also hit the southern port city of Aden, blasting rebel forces in outlying districts there. Street fighting continued in both cities, especially Taiz, where combat with rebels left dozens killed on both sides.

The officials spoke on condition of anonymity because they were not authorized to talk to the media.