Basil Ramadan, said to be in his 60s, used an AK-47 to gun down a group of militants at a checkpoint in Tikrit, a city northwest of Baghdad currently under ISIL control, before he was shot.

Mr Ramadan's son, Ahmed Basil, 18, was one of eight men executed by ISIL in January, accused of infiltrating the organisation and spying for the Iraqi government.

ISIL released photos from a video of the execution of Ahmed Basil Ramadan and seven others, all said to be police officers, accused of informing on the terrorist group for the Iraqi government.

Entitled 'the Day of Judgement', the photos from the video show eight Iraqi men dressed in orange Guantanamo Bay style jumpsuits.

Standing behind them are ISIL's notorious security forces, known for carrying out mass public executions in broad daylight.

Several of the victims, including Mr Ramadan's son, are named in the captions and appear to have been interviewed for the video as they are seen wearing microphones.