Allegations of beatings by UK soldiers in Iraq, published by the News of the World, are the latest in a series of claims during the three years since the invasion. Many have been proved true, others discounted in full or in part - while proceedings are still pending in other cases.
Abu Ghraib jail, near the Iraqi capital Baghdad, was the scene of abuse by US troops, revealed when graphic images were published around the world in April 2004.
Nine US soldiers were convicted of abuse at Abu Ghraib
Nine US soldiers were convicted of abusing prisoners during incidents in 2003.
One soldier, Lynndie England, was shown holding a naked Iraqi prisoner by a leash, and pointing to a naked inmate's genitals.
OCCUPYING FORCES CHARGED
The Abu Ghraib scandal came shortly after three US soldiers were discharged from the US army for mistreating Iraqi prisoners of war at Camp Bucca in the south of Iraq in May 2003.
An internal inquiry found soldiers had thrown prisoners down and kicked them in the head, groin and abdomen in an incident at Camp Bucca.
In November 2005, the US military said five soldiers were charged with abusing detainees.
The soldiers, from the 75th Ranger Regiment, were accused of punching and kicking detainees who were awaiting transfer to prison on 7 September.
It has not just been US or UK troops implicated in Iraq abuse. Five Danish troops were convicted of abuse, but were not punished as the court ruled there were "extenuating circumstances".
HOAX THAT FOOLED THE MIRROR
The Daily Mirror's photos were a hoax, resulting in the editor losing his job
In the UK, images allegedly showing UK troops abusing Iraqis were published by the Daily Mirror on 30 April, 2004.
In one picture a soldier is seen urinating on a hooded man, while in another the hooded man is being hit with a rifle in the groin.
However, the images turned out to be false and the newspaper's editor, Piers Morgan, was fired.
UK TROOPS ON TRIAL
But other photos were genuine, showing Iraqi prisoners being beaten at a humanitarian aid camp near Basra in May, 2003.
They came to light after a shop assistant in the UK contacted authorities when a soldier brought the film in to get developed. Three soldiers were found guilty of abuse after a trial in January 2005.
A fourth soldier - who took the photos - was sentenced to time in a youth detention facility and dishonourably discharged.
In November 2005, a court martial of seven Parachute Regiment soldiers collapsed after the judge ruled there was insufficient evidence.
The soldiers had all denied murdering 18-year-old Iraqi Nadhem Abdullah in May 2003.
And in July 2005, three soldiers from the Queen's Lancashire Regiment were charged with war crimes - one is accused of manslaughter, two of abuse - over the death of Baha Mousa in September 2003.
Seven soldiers face charges over the death of Baha Mousa
Four more QLR soldiers face other charges over the death and all seven will be tried by UK courts martial. The case is still outstanding.