Five suicide bombers attacked an Iraqi military base north of Baghdad on Sunday that killed at least 15 members of the security forces and wounded 22 others, security sources said.
Two of the bombers detonated their vehicle-borne explosives at the gate of Camp Speicher, a former US base outside the Sunni city of Tikrit.
Three others detonated their explosives after entering the base, the sources said.
DAESH terrorists claimed responsibility for the blasts in a statement distributed by supporters online.
Last week, Iraq declared the city of Ramadi liberated from DAESH clinching a landmark victory against the terrorist group.
Since then the terror organisation has continued to carry out counterattacks targeting Iraqi forces.
On Friday a military base was attacked by suicide car bombers and fighters wearing explosive belts.
"They managed to take control of the base when the army had to pull out because it suffered casualties... Iraqi forces have since counter-attacked and retaken control, with aerial coalition backing," said a lieutenant colonel.
DAESH, planted thousands of explosive devices on roads and in buildings to defend the city, when it captured Ramadi in May 2015.
Authorities are continuing efforts to clear the region.