The Saudi coalition carried out 35 missions targeting Houthi militia in Marib and Al-Jawf areas were carried out within 24 hours, a spokesman said on Thursday.
According to the coalition, the recent operations killed more than 200 Houthi militia and destroyed 24 military vehicles on-ground.
A total of 27,000 militants have been killed in battles in Marib, and the coalition spokesman warned that the Houthis would suffer more losses.
UN Secretary-General Antonio Guterres expressed his “deep concern” about two staff members being held by the Houthis in Sanaa on Wednesday.
One of the Yemeni men detained by the Houthis works for the United Nations Educational, Scientific and Cultural Organization, and the other works for the Office of the High Commissioner for Human Rights.
Both men are being held without charges and prevented from contacting their families, the secretary-general’s spokesman Stephane Dujarric said.
Guterres said the UN had received assurances from the Houthis, prior to last week's Security Council meeting on Yemen, that the staff would be released. However, they are still being detained.
“We don't understand why they have been detained and why are they not being released,” Dujarric said.
He called on the Houthis to immediately release the UN employees.
The secretary-general also condemned the summary execution of 10 individuals belonging to local security forces that took place in Hodeidah governorate on Nov. 13.
“These amount to serious violations of international humanitarian and human rights law which must be promptly and thoroughly investigated and perpetrators brought to justice. We call again on all sides to fully adhere to international humanitarian and human rights law under all circumstances,” Dujarric said.