The US has admitted for the first time its air strikes in Syria caused civilian deaths, after reports that two children died in an air strike last year.
"We regret the unintentional loss of lives," said Lieutenant General James Terry, head of the US-led campaign.
The admission by the government came after an investigation into the incident was conducted by US military authorities, directed by Lt Gen Terry.
A statement on the investigation said the Pentagon conducted a "thorough assessment, review and validation process" and concluded the target buildings were being used exclusively for military purposes.
"The coalition continues to take all reasonable measures during the targeting process to mitigate risks to non-combatants and to comply with the principles of the Law of Armed Conflict," Lt Gen Terry said.
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