Aden: Planes from the Saudi-led military coalition fighting in Yemen bombed areas around the capital Sanaa on Thursday, residents and the Houthi-run Al-Masirah TV said.
On Wednesday, the coalition vowed to respond firmly to a Houthi missile attack on a civilian airport in southern Saudi Arabia that wounded 26 people, including an Indian.
Masirah said there had been raids on three sites, including military targets belonging to Houthi forces, on the outskirts of Sanaa.
Residents told Reuters the strikes had targeted military camps west and north of the city.
There was no immediate confirmation from the coalition about the strikes.
The coalition has been battling the Houthi movement in Yemen since 2015, when it intervened to try to restore the internationally recognised government that was ousted from the capital Sanaa by the Houthis in late 2014.
The United Nations is deeply concerned about the attack, deputy UN spokesman Farhan Haq told reporters in New York.
"We urge all parties to prevent any such further incidents, which risk escalating the current situation, pose a serious threat to national and regional security and undermine the UN-led political process,” Haq said.
The attack comes against a backdrop of heightened US-Iranian tension following Washington's move to tighten sanctions on Tehran and to reinforce its military presence in the Gulf.
The escalation in violence could threaten a fragile UN-led peace initiative in Yemen's main port city of Hodeidah, which handles the bulk of the impoverished country's commercial and aid imports and is a lifeline for millions of Yemenis.