In a statement issued late on Wednesday, Qassemi denounced the Saudi-led coalition airstrike on a hotel in Arhab, 35 kilometers (22 miles) north of Sana'a, and expressed sympathy for the bereaved families of the victims. However, Fahd Marhab, head of the Umrah hospital, said there were no wounded and that all the people in the hotel were killed, claiming they were mostly civilians.
Meanwhile, local officials in the rebel controlled area told The Associated Press that at least 60 were killed.
United States officials have said they have tried to find ways to improve Saudi targeting.
Millions in the country now face starvation and disease, and more than 10,000 have been killed since 2015. This coalition supports Yemen's internationally-recognized, exiled leader Abed Rabbo Mansour Hadi.
The report did not attribute responsibility for the airstrikes but the Saudi-led coalition has maintained air superiority in Yemeni airspace since the outbreak of civil war in March 2015.
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The conflict has killed over 10,000 civilians, displaced 3 million people and pushed the impoverished nation to the brink of starvation.
The demonstrators came from different provinces across the country to the capital city to mark the 35th anniversary of the founding of National People Congress Party of Saleh.
The attacks led Saleh to back the Houthis, despite him having fought viciously against the Houthi movement when he was in office.
Saleh promptly left the square after speaking and shortly after heavy gunfire rang out nearby, but his supporters said it was celebratory and denied reports of clashes with Houthi fighters.
"What he (Saleh) said crosses the red line... and he will have to bear the consequences of his words".