The Iran-backed Houthis have rebuffed the latest US call to stop their deadly military offensive on the central Yemeni city of Marib, accusing the Americans of supporting their opponents.

Houthi spokesman Mohammed Abdul-Salam lashed out at the US on Wednesday for calling for the offensive to cease, and for renewing support for the internationally recognized government, accusing Washington of fueling the war in Yemen and imposing a “blockade.”

The latest Houthi statement was part of a series of criticisms of other countries and rights groups for rebuking them for refusing to stop military operations in the area, which have claimed the lives of thousands of combatants and civilians.

On Wednesday, the US special envoy for Yemen, Tim Lenderking, slammed the Houthis for attacking the city, warning that their offensive in the province would aggravate the already miserable humanitarian crisis in Yemen.

In a tweet sent by the US State Department’s Near Eastern Affairds branch, Lenderking and Yemeni Prime Minister Maeen Abdul Malik “condemned the Houthi offensive on Marib for exacerbating humanitarian suffering and sacrificing Yemen’s young men, and agreed on the need to restore political stability in southern Yemen.”

The US envoy also echoed his concerns about the impact of the Houthi attacks on Marib during a meeting with the Acting UN Special Envoy for Yemen Muin Shreim.

The Yemeni government said on Thursday that it would keep resisting Houthi attempts to seize control of new areas whilst complying with peace efforts to end the war.

Speaking to a gathering of government officials in Yemen’s Seiyun city on Thursday, Yemen’s Parliament Speaker Sultan Al-Barkani stated that tens of thousands of Yemenis who fled Houthi repression and sought refuge in Marib would not allow the militia to capture the city.

“We will continue to seek peace, but at the same time, we will not abandon fighting,” Al-Barkani said.

“The Houthis will not reach Marib. This is impossible for the Yemenis since Marib hosts hundreds of thousands (of people) who escaped from Houthi oppression and tyranny,” said Al-Barkani.

The government’s renewed pledges to defend Marib against Houthi incursions came as fighting raged on Thursday between government troops and the Houthis in several locations outside the city, near a military base in the west of the province and in mountainous areas and valleys in Rahabah to the south.

Yemen’s Defense Ministry said on Wednesday that 11 Houthis were killed in the southern city of Taiz after an attack on government-controlled areas in the northwest were foiled.

In the western province of Hodeidah, a landmine planted by the Houthis killed three civilians and wounded 11 on Thursday in Al-Durihimi district, the Yemeni Landmine Monitor said.

Yemen’s President Abed Rabbo Mansour Hadi on Thursday returned to the Saudi Arabian capital Riyadh from Cleveland, Ohio after a medical checkup, official news agency SABA said.

For almost a decade, Hadi has traveled frequently to the US to receive medical treatment for heart problems.