Fatou Bensouda said in a statement from the ICC, based in The Hague, that the initial investigation was reopened after new allegations were submitted.
"The new information... Alleges the responsibility of officials of the United Kingdom for war crimes involving systematic detainee abuse in Iraq from 2003 to 2008," Bensouda said.
Bensouda's office in early January received documents from the Berlin-based European Centre for Constitutional and Human Rights together with the Birmingham-based Public Interest Lawyers (PIL) alleging British involvement in torture, based on interviews with more than 400 Iraqi detainees.
The world war crimes court's previous chief prosecutor Luis Moreno-Ocampo in 2006 said he would not open a full probe in Iraq because he did not have enough evidence.
"Based on an initial assessment of the information received, the 10 January 2014 communication provides for further information that was not available to the Office in 2006," the statement said.
The dossier submitted in January by the ECCHR and PIL alleged that Iraqi victims suffered severe physical and psychological abuse at the hands of British forces.
"The victims make thousands of allegations of mistreatment amounting to war crimes of torture, or cruel, inhuman or degrading treatment," the ECCHR said.
Those who bear responsibility are "situated at the highest levels, including all the way up the chain of command of the UK army, and implicating former secretaries of state for defence and ministers for the armed forces personnel," it added.
The rights group said that the British government "has remained unwilling to genuinely investigate and prosecute low-level perpetrators.
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