Iraq has hanged 36 men convicted over the killing of up to 1,700 military recruits at a former us base in 2014.
the massacre at camp Speicher, near Tikrit, was carried out by fighters from so-called Islamic state (is) as it seized territory across northern Iraq.
the camp surrendered after it was surrounded by jihadists.
Among the thousands of captives, Shia men were sorted out, bound and taken away in lorries.
They were then forced to lie face down on the ground before being shot dead and their bodies were dumped in prepared trenches.
is militants released photos and video documenting the massacre in 2014. mass graves were found a year later.