A spokesperson for the Pentagon’s Central Command (Centcom) said the “preponderance of evidence” revealed when allegations over five attacks were investigated indicated that eight people were killed and three injured.
“We deeply regret the unintentional loss of life and injuries resulting from those airstrikes and express our deepest sympathies to the victims' families and those affected,” he added.
“The Coalition takes all feasible precautions to avoid civilian casualties during the course of military operations.
“In all of the cases released today, assessments determined that although the air strikes complied with the law of armed conflict and all appropriate precautions were taken, civilian casualties unfortunately did occur.”
The first strike was in Hawija, Iraq, on 12 April 2015, when a missile targeting an Isis “tactical unit” killed two unidentified civilians.
In Syria on 11 June, another Isis unit was being targeted in Suluk, Raqqa governate, when three civilians died.
Eight days later, a civilian was injured after “appearing in the target area after the US aircraft released its weapon” against two Isis vehicles in Tall al Adwaniyah, Syria.
On 29 June during strikes against Isis units and vehicles in Haditha, Iraq, two more civilians were injured.
“After the US aircraft engaged the target and two seconds prior to impact, a car slowed in front of the Isis vehicles while a motorcycle simultaneously passed by,” a Centcom spokesperson said.
“The target vehicle was destroyed in the strike but there was insufficient evidence to determine the level of injuries to the civilians operating the passing car and motorcycle.”
Three civilians were later killed in a strike against what the US terms an “Isis High Value Individual” in its de-facto capital of Raqqa on 4 July.
Centcom is reviewing further claims of civilian casualties in Syria and Iraq and said it will provide information on those investigations when they are completed.
In pictures: Syria air strikes (2014)
In pictures: Syria air strikes (2014)
Syrian citizens check a damaged house that targeted by the coalition airstrikes, in the village of Kfar Derian, a base for the al-Qaida-linked Nusra Front, a rival of the Isis group, between the northern province of Aleppo and Idlib
A Syrian boy (L) looking at a destroyed car that activists say was targeted by the coalition airstrikes, in the village of Kfar Derian, a base for the al-Qaida-linked Nusra Front, a rival of the Islamic State group, between the northern province of Aleppo and Idlib
Parts of a missile that activists say was fired by coalition airstrikes, in the village of Kfar Derian, a base for the al-Qaida-linked Nusra Front, a rival of the Isis group, between the northern province of Aleppo and Idlib
Tthe guided-missile destroyer USS Arleigh Burke (DDG 51) launching Tomahawk cruise missiles against Isis targets
The USS Arleigh Burke (DDG 51) launches a Tomahawk cruise missiles in the Red Sea, to conduct strike missions against Isis group targets in Syria
The guided-missile cruiser USS Philippine Sea (CG 58) launching a Tomahawk cruise missile against Isis targets in Syria, as seen from the aircraft carrier USS George H.W. Bush (CVN 77) in the Arabian Gulf
US navy sailors standing watch on the bridge while Tomahawk cruise missiles are launched against Isis targets in Syria, aboard the guided-missile cruiser USS Philippine Sea (CG 58), in the Arabian Gulf
The US-led airstrikes in Syria against Isis targets in and around the city of Raqqa
A fighter from the Isis group holds a piece of what the IS is saying is a US drone that crashed into a communications tower in the Syrian city of Raqqa
Fighters from the Isis organisation pray at the spot where the jihadist group said a US drone crashed into a communications tower in the Syrian city of Raqqa
Fighters from the Isis group load a van with parts that they said was a US drone that crashed into a communications tower in the Syrian city of Raqqa
Fighters from the Isis group load a van with parts that they said was a US drone that crashed into a communications tower in Raqqa
Fighters from the Isis group gesture as they load a van with parts that they said was a US drone that crashed into a communications tower in Raqqa. A US-led coalition on carried out its first air strikes and missile attacks against jihadist positions in Syria, with Damascus saying it had been informed by Washington before the operation began
A Syrian man rides his bike past a communications tower that was destroyed after a US drone crashed into it, according to fighters with the Isis group, in the Syrian city of Raqqa
People inspect a shop damaged after what Isis militants say was a U.S. drone crashed into a communication station nearby in Raqqa
A man holds the remains of what Isis militants say was a U.S. drone which crashed in Raqqa
Resident gather in the back of a van the remains of what Isis militants say was a drone which crashed in Raqqa
A man inspects the remains of what Isismilitants say was a U.S. drone which crashed into a communication tower in Raqqa
A man inspects the remains of what Isis militants say was a U.S. drone which crashed in Raqqa
Earlier on Friday, Russia had accused the US of killing civilians while denying reports its own air strikes have killed hundreds of innocent civilians and targeted anti-government rebels instead of Isis.
Amnesty International put the civilian death toll from Russian strikes at 200 “at least” in a report released last month, while the UK-based Syrian Observatory for Human Rights (SOHR) put it at almost four times that figure, saying more than 600 Isis militants were also killed.
Britain joined the US-led coalition of a dozen nations bombing Syria in December, while Russia is co-ordinating its operation with the Syrian government and Iran and an Islamic Military Alliance has been formed by Saudi Arabia.
UN-brokered peace talks on 25 January are hoping to bring the Syrian government and opposition together, although Isis and other terrorist groups that control huge swathes of the country are not invited.
The five-year conflict has so far killed at least 250,000 people and forced more than four million Syrians to flee their country as refugees
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