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Houthi rebels in Yemen have fired a mortar round at a Saudi Arabian border post, killing three Saudi officers and wounding two others, Saudi Arabia's Defence Ministry says.

A statement from the ministry on Saturday said that the incident took place the previous day in the Saudi border province of Najran.

The Saudi forces responded with gunfire, the statement said.

The ministry statement also said that since its campaign against the Houthis began last month, 500 Houthi fighters had been killed in clashes along the border.

Earlier this month, three Saudi border guards were killed in separate fighting with the Houthis.

Clashes in Aden

Meanwhile, in Aden, more than two dozen fighters and civilians died in fighting between Houthi rebels and gunmen loyal to President Abd Rabbu Mansour Hadi, as the Saudi-led coalition intensified its air strikes in and around Yemen's capital Sanaa.

The coalition said that it was targeting suspected weapons storage sites used by the Houthis. 

The air raids, which hit the Defence Ministry and facilities including al-Hafa military camp, lasted for several hours, Sanaa residents told the Reuters news agency. 

The Republican Guard was also targeted in the 17th straight day of coalition air strikes on the country.

The strikes came after fierce clashes in Aden killed at least 25 people, Agence France-Presse news agency reported.

Despite the fighting, planes carrying medical aid desperately needed by civilians have finally been able to land for the first time since the air strikes began more than two weeks ago.

 

Julien Harneis, a UNICEF representative in Yemen, told Al Jazeera he expected an "upsurge in malnutrition across the country" in the coming weeks.

"It was already a country where 60 percent of the country was living under the poverty line, that's not going to get any better," he said.

The weeks of heavy bombardment and fighting between rival armed groups, which has resulted in 650 people killed and 100,000 Yemenis displaced, has prompted the UN to call for a freeze in the violence.

 

UN humanitarian coordinator in Yemen, Johannes Van Der Klaauw, said an "immediate humanitarian pause in this conflict" was desperately needed to step up aid deliveries.

"The situation in Aden is extremely, extremely preoccupying if not catastrophic," he said, warning that the southern port city had fallen prey to "urban warfare" and "uncontrollable militias".

Saudi Arabia's UN ambassador, meanwhile, said a vote on a draft UN resolution, which would impose new sanctions on leaders of the Houthis and former President Ali Abdullah Saleh and his son, is likely to take place early next week.

Supporters of the resolution say it aims to end the Houthis' alleged attempt to take over the Arabian Peninsula country.

Source: Al Jazeera and agencies