The men had been working on a construction site near Mosul when they were captured in 2014.
The coalition acknowledges responsibility for only 326 of the deaths in the northern Iraqi city.
The U.S. coalition tasked with fighting ISIS in Iraq and Syria told Newsweek the world has not seen an urban assault like Mosul since World War II.
A U.K.-based monitor says U.S.-led efforts against ISIS have resulted in more civilian casualties during the seven months of the Trump administration than during 29 months under Obama.
Iraqi Foreign Minister Ibrahim al-Jaafari said he doesn't know what happened to 39 Indians kidnapped by ISIS in Iraq, but he'll pay to find out.
Canadian nationals were reportedly among those who joined the militant group in Iraq.
Iraq's second city, and other areas retaken from Iraq, need more than a military strategy.
"Of all the wars I have covered in various countries, Mosul has been the worst."
Despite being largely defeated in its former Iraqi stronghold of Mosul, the Islamic State militant group is still gaining territory amid new clashes.
A report by the human rights organization Amnesty International has detailed how since October 2016, ISIS carried out a systematic campaign of forced displacement in the Mosul area.
U.S. allies and enemies have praised Iraq for defeating the Islamic State militant group in Mosul, highlighting the complex nature of battling ISIS.
An Iraqi military spokesman cited by local TV said the militants' defense lines were collapsing.
Facing near-total defeat in its former stronghold of Mosul, the Islamic State militant group has launched a new, deadly offensive in Iraq.
Iraqi forces have been constantly slowed in their efforts to take the last square mile of territory controlled by jihadis.
Iraqi forces are making women remove their headscarves after 38 female suicide bombers struck over the past month.
Three bombers mingled with refugees that had fled jihadi strongholds in Iraq.
The group destroyed the mosque earlier this month amidst its final stand for the city.
The sniper stopped an ISIS ambush on Iraqi security forces with a shot from over two miles.
Former Iraqi envoy to the U.S. asks: Do Iraqis want a united or divided country?
U.S. Army Major General Joseph Martin, head of ground forces for the U.S.-led coalition fighting ISIS, tells Newsweek of the complex offensive that Iraqi forces are facing.
ISIS fighters reportedly crowded civilians into a locked building and goaded U.S. jets to fire on them.