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U.S. military mission in Iraq costs $7.5m a day: Pentagon

American warplanes have carried out more than 100 air strikes against ISIS militants since August 8

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The U.S. military's bombing raids and other operations in Iraq cost about $7.5 million a day, the Pentagon said Friday.

Since Islamic State of Iraq and Syria (ISIS) militants seized territory in northern and western Iraq in June, President Barack Obama has deployed about 865 U.S. troops to Iraq to bolster security for American diplomats and advise Baghdad government forces fighting the extremists.

Both manned and unmanned U.S. aircraft have flown surveillance flights to track ISIS militants and since August 8, American warplanes have carried out more than 100 air strikes against the militants -- most of them around the strategic Mosul dam in the north.

The price tag of the U.S. military mission dating back to mid-June has "averaged $7.5 million a day," Pentagon spokesman Rear Admiral John Kirby told reporters.

But the cost has varied day to day and "as our activities have intensified, so, too, has the cost," Kirby said.

The operation was covered under the "overseas contingency operations fund," Kirby said. The contingency fund is a separate budget from the annual U.S. defense budget purportedly set up to cover war-related costs.

The contingency fund was created in 2003 after the U.S.-led invasion of Iraq and critics say it is a way of hiding the costs of war or other military spending.

Of the more than 800 U.S. troops now in Iraq, nearly 300 are working as advisers to Iraqi security forces.

Four more air strikes were carried out in the past 24 hours against ISIS militants near the Mosul dam, U.S. Central Command said in a statement Friday.

American warplanes hit four ISIS "armed vehicles," damaged another and destroyed three "support vehicles," it said.

F/A-18 fighter jets based on a U.S. aircraft carrier in the Gulf, the George H.W. Bush, have been taking part in the air attacks.

The Pentagon said last week that Kurdish and Iraqi government forces seized back control of the dam from the ISIS militants, following a wave of U.S. air raids.

But the U.S. bombing runs around the dam have continued.

Kirby said the air strikes were needed because ISIS militants continued to launch attacks to try to retake the dam.