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Pentagon investigation into deadly airstrike in Mosul says U.S. bomb ignited Islamic State explosives

With the help of family members, Iraqi civil defense force members on March 24, 2017, recover a body buried in the rubble of a home destroyed by airstrikes in the Jadidah neighborhood of Mosul.
With the help of family members, Iraqi civil defense force members on March 24, 2017, recover a body buried in the rubble of a home destroyed by airstrikes in the Jadidah neighborhood of Mosul.
(Marcus Yam / Los Angeles Times)
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A two-month investigation into a U.S. military airstrike in Iraq that caused some of the worst civilian casualties in decades found that the attack inadvertently set off explosives that gutted a sprawling apartment block and killed at least 105 civilians — far fewer than survivors and other witnesses have claimed.

Residents have insisted that several hundred people died. Iraqi civil defense forces initially put the figure at 278 but scaled that back to 142 on Thursday, after the U.S. report was released.

The deadly March 17 incident in Jadidah, a densely populated neighborhood in the war-torn Iraqi city of Mosul, garnered worldwide attention after photos of smoldering rubble mixed with lifeless bodies rippled across social media.

The Pentagon said military investigators, led by Air Force Brig. Gen. Matthew Isler, twice visited the site of the airstrike, spoke to witnesses and pored through more than 700 videos taken from coalition warplanes over a 10-day period before, during and after the airstrike.

According to the Pentagon account released Thursday, a U.S. military warplane dropped a 500-pound GPS-guided bomb on two Islamic State fighters firing on Iraqi forces from the roof of a building in Jadidah. The investigation said the GBU-38 bomb should have killed the pair and maintained the structural integrity of the two-story building, which was constructed of reinforced concrete and had 30-inch walls at points.

Mohamed Fadil, 38, said he was forced to bury his wife, cousin and cousin's wife in his yard after they were killed in an airstrike March 17 in west Mosul's Jadidah neighborhood. (Molly Hennessy-Fiske / Los Angeles Times)
(Molly Hennessy-Fiske / Los Angeles Times)

Instead, a massive explosion ripped through the neighborhood, reducing the apartment block to flaming wreckage, twisted rebar and a tomb for innocent civilians.

The investigation said 101 bodies were found in a main building, and four others were killed in a nearby building.

The Pentagon released an “executive summary” of the investigation, called a 15-6. The full report, which likely includes hundreds of documents, is classified.

Isler told reporters at the Pentagon via teleconference from Randolph Air Force Base in Texas that the massive blast was caused by explosives planted by Islamic State.

“No one saw ISIS move explosives into that area,” he said, using an acronym for the terrorist group. “However, there were multiple opportunities for that to happen, so we did not rule that out.”

Investigators came to the conclusion that the militants planted the explosives, he said, because the chemical residue left behind was different from those found within the GBU-38. They said the size of the blast suggested there was four times as much explosive material as contained in the U.S. bomb. A GBU-38 has a 192-pound warhead.

“The secondary explosion caused a rapid failure of the structure,” Isler said.

The civilians were found in the basement, sheltering from the battle raging outside, Isler said, while the explosives were put on the second floor. Isler said Islamic State intentionally lured the airstrike knowing civilians were in the building and knowing the planted explosives likely would bring the structure down.

The airstrike was delivered by a U.S. aircraft after Iraqi forces, taking fire from the two snipers, called it in. Iraqi counterterrorism service members were watching the building for two days and saw no sign of civilians inside, Isler said.

U.S. reconnaissance aircraft were overhead watching the facility but also did not see the civilians, Isler said. However, the spy planes could not watch the building in the two days preceding the strike because of bad weather, he added.

“The coalition takes responsibility for the strike,” Isler said.

Mosul resident Khalid Zakhi, who survived the attack but whose wife and son were killed, said he was encouraged by the report.

“For the coalition and America to hold themselves responsible for the airstrike is a good sign, and we would like for them to look after those who lost their loved ones,” said Zakhi, 51, a Mosul University worker. He asked that the coalition “help those whose homes were damaged by rebuilding … so they will be able to return to their homes.”

He said that most families left homeless by the blast are faring poorly because they have nothing to live on.

PHOTOS: Deadly airstrike in Mosul kills scores of civilians »

Mohamed Danoon Jasim, whose relatives also were killed, said the acknowledgment by the U.S. is “not going to change anything on the ground and will not give us anything.”

“Imagine you lost more than 20 members of your family, and the murderer comes to you and says, ‘I am sorry.’ That is not acceptable,” he said. “If they compensate families, it will be better.”

The coalition does not usually compensate civilians for accidental strikes, with the exception of occasional sympathy payments.

Amnesty International issued a statement saying it welcomed the U.S. report, but questioned “whether any lessons were learned and what steps were taken to ensure such horrors do not occur again.”

“We are in no position at this stage to confirm or deny the results of the U.S. investigation,” said Samah Hadid, the group’s Middle East deputy director of campaigns. “But as long as the conflict in Iraq is still raging, we call on Iraqi and U.S.-led coalition forces to desist from using explosive weapons with wide area effects, including artillery and mortars in crowded residential areas and to take all feasible precautions to avoid civilian casualties.”

As a result of the airstrike, U.S. investigators recommended in the report that the Pentagon intensify the way it investigates whether its daily bombing runs over Iraq and Syria are inadvertently killing civilians.

The report also advocated that the two-person team investigating civilian casualties for the U.S.-led coalition fighting Islamic State extremists be expanded and that teams of investigators begin visiting the sites where residents say civilians have been injured and killed by airstrikes.

Under the existing system, the coalition investigates civilian casualties based on reports from its staff, the news media, social media and local and international monitoring groups. Investigators are not required to visit the scene of strikes, speak with victims or other witnesses.

An Iraqi civil defense force member stands guard while work is done to remove the rubble and dead bodies from a home destroyed by a coalition air strike in the Jadidah neighborhood of Mosul on March 24, 2017. (Marcus Yam / Los Angeles Times)
An Iraqi civil defense force member stands guard while work is done to remove the rubble and dead bodies from a home destroyed by a coalition air strike in the Jadidah neighborhood of Mosul on March 24, 2017. (Marcus Yam / Los Angeles Times)
(Marcus Yam / Los Angeles Times)

The U.S. military says 352 civilians have been killed in airstrikes by the coalition since the air war against Islamic State was launched in August 2014 — still far fewer than independent monitor Airwars’ estimate of 3,294.

A Times reporter visited the site of the strike a week afterward, as well as earlier this month, and saw multiple damaged buildings with bodies in or near them where residents said civilians had died. During the visit this month, distant booms sounded regularly, warplanes buzzed overhead and mortar shells were still landing nearby.

Jadidah residents provided The Times with the names of at least 100 relatives killed in the March 17 strike whose bodies they buried. The dead ranged in age from 65 to a 1-month-old. Residents said that the death toll was much higher than 100, and that 137 people died in one house.

Residents provided photographs showing how they buried about half of the dead — whom they estimated in the hundreds — at two local cemeteries, and the remaining bodies in gardens and other informal graves because Islamic State militants did not allow survivors to leave the area for days after the airstrike.

Mohammed Fadhil stood outside his house this month and pointed to the graves of three relatives killed in the strike whom he buried: his wife, a cousin and the cousin’s wife. He also provided photos showing relatives lowering the dead, zipped inside blue plastic body bags, into the makeshift graves.

Fadhil, 38, said clashes in the area after the strike prevented residents from reaching local cemeteries. He said 60 homes were destroyed in the March 17 strike, and hundreds were killed, with some bodies even now still beneath the rubble.

Iraqi officials conducted their own investigation and announced their conclusions last month, saying that 61 civilians were killed — but not by an airstrike, rather by explosives planted in the walls of the buildings by Islamic State militants.

The Iraqi investigation said explosives and a detonator were found at the scene, and it concluded that Iraqi forces also had located civilians in two nearby homes laced with explosives.

On Thursday, Brig. Gen. Mohammed Mahmoud, the manager of Iraqi civil defense in Mosul, said 142 civilians died in the strike. He said the total previously provided to The Times — 278 civilians killed — referred to the total number of civilians killed by airstrikes and artillery in all of west Mosul since the offensive began. Independent monitors have put the figure much higher.

Mahmoud said 85 of those killed in the March 17 strike died in the large house where residents said 137 were killed. He said 105 died in the area surrounding that house.

Although Islamic State’s use of human shields always figured into the investigation, the U.S. military said there is no way of knowing whether militants had trapped civilians inside the building.

Civilian deaths have risen steadily in recent weeks amid a torrent of airstrikes and pounding house-to-house combat ravaging Mosul, Iraq’s second-largest city, as the bloody campaign against Islamic State in Iraq and Syria reaches its third year.

Times staff writer Hennigan reported from Washington and Hennessy-Fiske from Riyadh, Saudi Arabia. Special correspondent Wael Resol in Suleimaniya, Iraq, contributed to this report.

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UPDATES:

11:50 a.m.: This article was updated with additional Pentagon statements and background as well as comments from survivors and Amnesty International.

This article was originally published at 8:35 a.m.

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