| Islamic State militants filmed soldiers they captured in Tikrit, prior to their killing |
Iraq has hanged 36 men convicted over the killing of up to 1,700 military recruits at a former US base in 2014.
| Mass graves were discovered near Camp Speicher after Iraqi forces recaptured the area in 2015 |
| Hundreds of bodies have been exhumed since the massacre |
Some 400 of the army recruits who died were from Dhiqar province. The spokesman said that Justice Minister Haidar al-Zamili was present at the executions.
Prime Minister Haider al-Abadi had said after last month's Baghdad bomb blast that killed more than 300 people that he wanted to speed up executions of terrorism convicts.
Those executed on Sunday, all believed to be Iraqi citizens, had been sentenced to death in February. Some of the defendants said they had not been near Tikrit at the time of the massacre, while others said they had been denied access to lawyers, or had been forced to confess under torture.