Iraqi forces backed by warplanes on Sunday repelled a Daesh attack on a strategic town only 40 kilometres west of the capital Baghdad, the Daily Star quoted security sources as saying.
Daesh attacked Amriyat al-Fallujah at around 1:00 am (2200 GMT on Saturday), local police chief Aref al-Janabi said.
"They attacked from two sides ... The fighting lasted five hours," he said, adding that soldiers, policemen and Sunni tribesmen were fighting together to defend the town.
"Warplanes eventually engaged the insurgents and killed 15 of them," he said.
According to Janabi, the Daesh military leader in the nearby city of Fallujah - whom he named as Mullah Jassem Mohammed Hamad - was killed leading the attack.
A military intelligence officer at the operations command for Anbar province, of which Amriyat al- Fallujah is part, also reported the Daesh leader's death.
It was not immediately clear which air force intervened but French and US jets have carried out airstrikes in areas west of Baghdad.