These are among the more than 130 air strikes carried out since early August.
The latest US strikes, the first in the area, were to protect the Iraqi forces and Sunni tribesmen in control of the dam. The Islamic State fighters have targeted a number of dams in their offensive and have captured the facility at Fallujah.
A US official has clarified that the strikes were carried out at the request of the Iraqi government and in keeping with the US mission to protect its personnel and facilities in Iraq.
The Pentagon's press secretary, Rear Admiral John Kirby, has added that these strikes were meant to prevent terrorists from further threatening the security of the dam, which remains under control of Iraqi security forces, with support from Sunni tribes.
The US has carried out a number of air strikes to support Iraqi and Kurdish forces as they try to halt the advance of the IS militants in the north and west.
The IS militants had taken the largest dam, at Mosul, but US air strikes helped force them out and it had attempted to capture Haditha dam, on the Euphrates valley in western Anbar province – this is Iraq's second largest dam.
Incidentally, IS also controls other key national assets like several oil and gas fields in western Iraq and Syria.
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