The officers say six attackers struck the base this morning. Five detonated suicide vests once inside the centre and the situation is now under control.
The officers spoke on condition of anonymity in line with regulations.
No group immediately claimed responsibility for the attack but it resembles similar strikes carried out by the Islamic state group.
The attack comes as Iraqi forces are closing in on the last IS held neighbourhoods in western Mosul nearly three years after the extremists overran almost a third of Iraq in 2014.