Claims swirled that hardline IS chief Abu Bakr al-Baghdadi had been killed in the attacks late Friday, but US officials yesterday could not confirm if he had even been present.
The news came after US President Barack Obama unveiled plans to send up to 1,500 more US troops to Iraq to help battle the militants who have seized a large swathe of territory.
In fresh violence, some 33 people were killed in a wave of car bombings against Shiite areas in the capital Baghdad, highlighting again the security challenge facing Iraqis even within government-controlled zones.
US Central Command confirmed that coalition aircraft conducted a "series of airstrikes" against "a gathering of ISIL leaders near Mosul."
A convoy of 10 armoured vehicles from the group also known as ISIL was destroyed. "We cannot confirm if ISIL leader Abu Bakr al-Baghdadi was among those present," CENTCOM spokesman Patrick Ryder said in his statement, using another acronym by which the group is known.
A strike against Baghdadi, who has proclaimed himself the "caliph" of a state straddling Iraq and Syria, would be a major coup for the US-led coalition. Washington has offered a USD 10 million reward for his capture, and some analysts say he is increasingly seen as more powerful than Al-Qaeda chief Ayman al-Zawahiri.
In a video posted online in July, purportedly the first known footage of Baghdadi, he ordered all Muslims to obey him during a Ramadan sermon in Mosul.
Al-Arabiya TV reported Baghdadi had been wounded, while a local Iraqi channel said one of his aides was killed. Iraqi leaders said the new US military trainers who will aid its fight against jihadists are welcome, but come "late."
Ryder added the US-led strikes were a further sign of "the pressure we continue to place on the ISIL terrorist network."
The aim was to squeeze the group and ensure it had "increasingly limited freedom to manoeuvre, communicate and command."
The new troops will roughly double the number of American soldiers already in the country and marks a deepening US commitment in the open-ended war.
"This step is a little late, but we welcome it," a statement from Iraqi Prime Minister Haidar al-Abadi's office said.