It was one flag that could evoke horror. Yet it was put up for auction at a Sydney mosque, which was thronged with people, even children. And it went for over $2000. Even a drawing of the flag was bought.

The flag belonged to Islamic State members, who had allegedly murdered thousands in Iraq and Syria, and beheaded two western journalists, James Foley and David Sotloff.

Australian teenagers are sharing the video of the auction. Some teens have even adopted the radical violence beamed by the Islamic State, symbolized by the black and white flag featuring the Shahada, which translates into an Islamic oath: "There is no God except God and Mohammed is the messenger of God."

A Muslim 15-year-old put up stills of the auction in his Instagram account, followed by more images of jihad's black flag. There was another picture of his own face with a headscarf, with a caption that talked of assassinating Bashar al Assad, the Syrian President. According to The Daily Telegraph, a Muslim leader accused the IS militants of "hijacking" the Shahada symbol. Political leaders condemned the auction at the Markaz Imam Ahmad mosque and youth centre by Sheikh Abu Adnan Mohamad.

Premier Mike Baird condemned the action, and was firm that the state government was not going to be lenient to actions that provided relief to terrorists. "I note that the Islamic State is listed by the Commonwealth government as a terrorist organisation and that it is against the law to provide it with any support," he is quoted as saying in The Daily Telegraph. He called upon the citizens of NSW to obey the law or be ready for the results of their actions. He added that it was important that everyone extends support and protection to the youth, especially from the "insidious and corrosive effects of the radical ideologies" that were assaulting the world.

Another MLC, Fred Nile, cried that the auction was "disgraceful" and called for a ban of the flag. "They fly the flag as something to be proud of - they should be ashamed of beheading people and selling women into slavery," he is reported to have said.

However, the NSW Police investigated the actions, and pointed out that the auction could be called an offence only if its proceeds were directed to "terror groups". The stated objective of the auction was to raise money for the mosque.

Attorney-General George Brandis has, meanwhile, indicated that the government wants to bring in some laws that brand supporting terrorism illegal. After all, the Commonwealth has categorised IS as a terrorist body.

Muslim community leader, Keysar Trad, defended the sale, saying that the Islamic State had "hijacked" the black and white standard, which bears the Shahada, according to The Daily Telegraph.