In a new report, the UN laid out a long line of allegations of grave human rights abuses by all sides in Yemen's bloody conflict, which has left nearly 4,000 civilians dead.
"Civilians in Yemen have suffered unbearably over the years from the effects of a number of simultaneous and overlapping armed conflicts," UN rights chief Zeid Ra'ad Al Hussein said in a statement.
"And they continue to suffer, absent any form of accountability and justice, while those responsible for the violations and abuses against them enjoy impunity," he said.
The report listed numerous attacks on residential areas, market places, hospitals and schools, pointing out that in several cases investigators were "unable to identify the presence of possible military objectives."
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It also condemned targeted killings -- including of at least six journalists -- the use of cluster bombs, landmines, and sniper attacks, and the rampant use of child soldiers.
As of August 23, an estimated 3,799 civilians had been killed and 6,711 injured since a Saudi-led Arab coalition began air raids in March last year in support Yemen's internationally recognised government and President Abedrabbo Mansour Hadi.
The World Health Organisation says more than 6,600 people have died in all, counting combattants, while more than 33,000 have been injured.
Air strikes by the Saudi-led coalition were suspected of causing around half of all civilian deaths, while attacks by groups affiliated with the rebels were blamed for around a quarter of the deaths, Thursday's report said.
Islamic State group jihadists, Al-Qaeda and a range of other actors accounted for the remainder, it said.
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