Ultra conservative militant group Islamic State (ISIS) shot and killed 13 teenaged football fans watching the Asian Cup football match between Iraq and Jordan in Mosul.

The ISIS police reportedly apprehended the boys watching the football match on TV in Mosul, the second largest Iraqi city that since June has been under ISIS control. Since then, the city is governed as per the strict dictates of Sharia as interpreted by the Islamic State.

In all ISIS controlled area, the militant group has imposed strict ban against any entertainment including music and football. It considers football an 'evil' sport devised by the West to mislead the Muslim youth.

The 13 boys, who were all in their teens were rounded up and put before a firing squad, reported The Daily Mail.

Citing the Syrian underground' activist group -- Raqqa is Being Slaughtered Silently -- the report noted that "the bodies of the dead boys were left in the open, as ISIS had warned anyone from touching their bodies.

"Their parents were unable to withdraw them for fear of murder by terrorist organisation," the activist group noted.

In the Iraq-Jordan Asian Cup game last Monday that took place in Brisbane, Australia, Iraqi midfielder Yaser Kasim gave Iraq a 1-0 win.

The Islamic State in the last one week has carried out numerous executions in Mosul. Recently two 'gay' men were thrown off the roof of a tower in full public view as punishment for their crime.

On the same day, the Islamic State stoned a woman to death on charges of adultery, while another two men were shot at point-blank for stealing.

Similarly, London-based Syrian Observatory for Human Rights noted that ISIS crucified 17 young men in a gap of 48 hours last week as a direct retaliation for the deaths of 12 Syrian, Iraqi and Algerian jihadists.