Members of the public look at floral tributes placed near the cafe where hostages were held for over 16-hours, in central Sydney December 16, 2014. Heavily armed Australian police stormed a Sydney cafe early on Tuesday morning and freed terrified hostages
Members of the public look at floral tributes placed near the cafe where hostages were held for over 16-hours, in central Sydney December 16, 2014. Heavily armed Australian police stormed a Sydney cafe early on Tuesday morning and freed terrified hostages held there at gunpoint, in a dramatic end to a 16-hour siege in which two captives and the attacker were killed. REUTERS/David Gray (AUSTRALIA - Tags: CIVIL UNREST POLITICS)

Australians fighting alongside ISIS are openly mocking the tragic Sydney siege on Twitter. While messages of support and condolences are being circulated in social media, an Australian boxer who has joined ISIS made fun of the hostage situation in Martin Place where wwo hostages had died and the hostage taker Man Haron was killed after police stormed the Lindt café.

According to TVNZ, Mohammed Elomar is a known extremist and left Sydney in 2013 to fight in Syria. He has previously posted photos of himself holding up the severed heads of slain Syrian soldiers. The 30-year-old Australian ISIS fighter is suspected of running the Twitter account, Abu Hafs Al Australi. Elomar had cruelly laughed at the horrific scene that unfolded in Sydney.

Just before Australian police took action, Elomar tweeted, "I think we got ourselves a real life hostage situation in Sydney lolololololololol." His second tweet read: "Mumbai Crisis on the streets of Sydney. Maximum damage."

The former Australian boxer was not the only one mocking the Sydney siege. Another ISIS supporter also posted a series of messages on social media. Abu Hamza AlMuhajir, a close friend of an ISIS commander Mohammad Ali Baryalei and a former member of an Australian Islamist education group, said the world must stand for "news of the 13 Australian hostages but it would sleep for the news of over 13000 Muslims killed in Syria."

AlMuhajir mocked the trending Twitter hashtag #sydneysiege that thousands of people online have been using to express their sympathies and outrage at the hostage situation. He said Sydney was not under siege unlike Gaza, Homs and Damascus. He posted that the #sydneysiege hashtag was "a joke."

Meanwhile, terrorism experts believe that the man behind the Sydney siege appeared to have acted as a "lone wolf" and influenced by ISIS' ideology. Although Monis does not have clear connections with ISIS militants, one of his demands was to have an ISIS flag brought to him. According to Vocativ, many believe his actions were influenced by the militant group in the Middle East.

An online forum believed to be run by ISIS, Tribune Media Jihadist, does not confirm that Monis is one of their own. Forum members are reportedly baffled about all the attention. The hostage taker in Sydney had used four of his hostages to deliver the message that his act was "an attack by the Islamic State on Australia." He then demanded authorities to provide him with the ISIS flag which led people to believe he had ties with ISIS.

Vocativ noted that ISIS supporters on the forum appeared to be happy claiming responsibility for the Sydney siege but when the identity of the attacker was revealed, things started to look different. Local media reported him as an Iranian native and more likely a Shiite Muslim. Although he praised ISIS on his Facebook page, prominent members on ISIS online forums had kept their distance after the siege.

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