The US Air Force delivered this aid alongside aircraft from Australia, France and the UK who also dropped much needed supplies, Pentagon Press Secretary Rear Admiral John Kirby said.

In conjunction with this airdrop, US aircraft conducted coordinated airstrikes against terrorists in order to support this humanitarian assistance operation, Kirby said.

These military operations were conducted under authorization from President Barack Obama to facilitate the delivery of humanitarian assistance and to prevent an attack on the civilians of Amirli by the militants, he added.

"The operations will be limited in their scope and duration as necessary to address this emerging humanitarian crisis and protect the civilians trapped in Amirli," he said.

So far the US has conducted a total of 115 airstrikes across Iraq.

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