"We have exhumed the bodies of 470 Speicher martyrs from burial sites in Tikrit," Adila Hammoud said at a press conference in Baghdad, referring to the nearby military base that the massacre was named after.
In June 2014, armed men belonging or allied to the Islamic State group abducted hundreds of young, mostly Shiite recruits from Speicher base, just outside the city of Tikrit.
They were then lined up in several locations and executed one by one, as shown in pictures and footage that has emerged since.
The highest estimate for the number of people killed in one of the worst atrocities ever committed by IS stands at 1,700.
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"These bodies come from four burial sites... One of them was bigger than the others and contained 400," said Ziad Ali Abbas, the chief doctor at Baghdad's main morgue.
He said forensic examination of the exhumed remains was conducted with foreign assistance, including from the International Committee of the Red Cross.
Officials at today's press conference said the first list of names would be released next week.