Afghan Forces guard an area in Kabul.File
The strike happened between late Friday and early Saturday in support of ground operations conducted by pro-government forces fighting against Taliban militants in the area.
"Initial fact-finding indicates that 10 of those killed were children, part of the same extended family whom were displaced by fighting elsewhere in the country," the UN mission in Afghanistan said in a statement.
The US is the only member of the international coalition in Afghanistan that provides air support in the conflict.
A NATO spokesperson told AFP the coalition was investigating the claims.
The deaths come as ordinary Afghans continues to bear the brunt of the war in Afghanistan, with more civilians killed in the Afghan war in 2018 than during any other year on record, according to a UN report.
The uptick in violence in 2018 coincides with a significant increase in the number of deaths caused by the "deliberate targeting of civilians", according to the report, mostly stemming from suicide attacks by insurgents allied with the Taliban or Daesh.
An increase in air strikes by US and Afghan forces also led to more civilian deaths in 2018, with more than 500 civilians killed by "aerial operations for the first time on record."
Fighting continues to flare across Afghanistan even as the US and Taliban press forward in peace talks aimed at ending nearly 18 years of fighting.
The ongoing peace talks with the Taliban follow years of escalating violence in Afghanistan.
According to the UN, at least 32,000 civilians have been killed and another 60,000 wounded in the last decade.
No group has claimed responsibility for the attacks, which officials said were carried out by at least seven suicide bombers on three churches and four hotels. About 500 people were also wounded.
Daesh's claim, issued on its AMAQ news agency, came shortly after Sri Lanka said two domestic militant groups, with suspected links to foreign militants, were believed to have been behind the attacks at three churches and four hotels, which wounded about 500 people.
The Taliban on Friday announced their annual spring offensive, which comes as the US and Afghan politicians try to negotiate for a peace settlement with the militants.
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