"During the month of December, at least 62 civilians were reported to have been killed by airstrikes attributed to the coalition forces," Rupert Colville, spokesman for the UN human rights agency, told reporters.
That number, he pointed out, was more than double the 29 civilians reported killed in such strikes a month earlier.
The number of civilians killed by the Iran-backed Shiite Huthi rebels and their allies was meanwhile cut by two thirds to at least 11 in December from 32 a month earlier, Colville said.
The dramatic increase in the number of civilians killed in airstrikes came despite a ceasefire declared on December 15, at the same time as UN-backed peace talks between the warring sides began in Switzerland.
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But the talks ended five days later with no major breakthrough, and the ceasefire collapsed on January 2 after being violated on a daily basis.
Colville pointed out that UN rights agency staff had begun receiving reports of violations "within minutes of the ceasefire beginning."
The ceasefire certainly did little to shield civilians.
The airstrikes have continued into the new year, with some 11 strikes taking place in Sanaa on Sunday and Monday alone, with reports of further airstrikes today morning, Colville said, pointing to reports indicating that civilian buildings had been hit in densely populated areas of Sanaa.
Colville also decried "alarming information" that coalition forces used cluster bombs in Hajjah governorate, saying that a field visit by UN rights office staff last month had found remnants of 29 cluster submunitions near banana plantations in the village of al-Odair in Haradh district.
Colville also voiced particular concern at the humanitarian situation in violence-wracked Taez, lamenting that "strict control of all entry points into the city by the popular committees affiliated with the Huthis has resulted in limited access to essential items, including food.