Pro-government forces backed by a Saudi-led coalition retook Yemen's biggest airbase from Iran-backed rebels on Tuesday in a significant new gain after recapturing second city Aden last month.
Their seizure of Al-Anad base in a 24-hour assault using heavy armour supplied by the coalition came after hundreds of Gulf Arab troops landed in Aden to bolster the loyalist fightback.
Hailing victory in the battle for Al-Anad, the defence ministry vowed no let-up in the war against the Shiite Huthi rebels and their allies until the authority of exiled President Abedrabbo Mansour Hadi was restored over the whole country.
The airbase, 60 kilometres (40 miles) north of Aden, is strategically located on the main road north towards both the battleground third city of Taez and rebel-held capital Sanaa.
The vast complex housed US troops overseeing a drone war against Al-Qaeda in Yemen until shortly before the rebels overran it in March.
Its loss is a major blow to the insurgents, whose leader Abdulmalik al-Huthi claimed just Sunday that their ouster from Aden after four months of ferocious fighting was merely a "short-term" setback that would be reversed.
The loyalists retook the rebel-held Labouza army camp 10 kilometres north of Al-Anad, military sources said, with one declaring late Tuesday: "We are now inside the HQ at Labouza."
To the south, pro-government forces also took Huta, the capital of Lahj province, loyalist commander Colonel Adel al-Halimi told AFP, adding that "some pockets of resistance remain in the northern suburbs".
- Columns of tanks, artillery -
Military sources reported several dead and wounded at Labouza and Huta.
Pro-government sources said that the rebels lost 70 dead and 10 captured in the fighting for Al-Anad.
The loyalists suffered 24 dead and 23 wounded.
Officers who took part in the assault said the rebels had put up "stiff resistance" but that Saudi-led air strikes had helped destroy their armour.
An AFP correspondent saw columns of coalition-supplied tanks and artillery pounding the base's defences.
They were accompanied by large numbers of southern militiamen who formed the core of the resistance to the rebels before the deployment of reinforcements trained and equipped in Saudi Arabia.
The recapture of Al-Anad is a major boost for the defence of Aden and paves the way for a possible return by the exiled government to the southern port which was its last refuge before it fled into exile in neighbouring Saudi Arabia in March.
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On Sunday, hundreds of Gulf Arab troops from the coalition entered Aden with tanks and other armour.
The Saudi-owned Al-Hayat newspaper said 1,500 troops, mostly from the United Arab Emirates, had deployed there.
Aden has been devastated by four months of coalition air strikes and fighting on the ground.
Unexploded ordnance and booby-traps still pose a daily threat to civilians.
- Health services 'nearing collapse' -
Medics said Tuesday that at least 18 had been killed and dozens wounded in the previous 24 hours alone.
Doctors Without Borders (MSF) warned that Yemen's health services were "nearing collapse".
"The population is faced with food shortages, the health system is in a state of collapse. I have never seen such a level of violence," MSF's Aden coordinator Thierry Goffeau said in Paris.
The United Nations says the war has killed nearly 4,000 people, half of them civilians, while 80 percent of the 21-million population needs aid and protection.
Nearly 100,000 Yemenis have fled abroad since late March, the UN refugee agency says.
Despite losing Aden, the rebels still control large swathes of Yemen, including Sanaa which they overran last September.
The United Nations has called repeatedly for a ceasefire. Peace talks in Geneva in June collapsed without the warring parties ever sitting down in the same room.
The exiled government said it would only discuss the rebels' withdrawal from all of the territory they have seized, in line with a UN Security Council resolution adopted in April.
The rebels said they could not pull out as that would create a security vacuum that would expose them to jihadist attack.
Sunni extremists of both Al-Qaeda and the Islamic State group have attacked the Shiite rebels and their supporters, whom they regard as apostates.
On Tuesday, the UN said the Arab League had indicated it would consider sending peace monitors to Yemen if a ceasefire was agreed.