Suspected Australian militant holding severed heads offers $1,000 bounty

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An image believed to be of Mohamed Elomar holding severed heads posted to Twitter.

- Security has been stepped up around a prominent Australian Muslim leader after Twitter threats from a Sydney-based militant seen in recent photos clutching severed heads in Syria.

In a tweet that's since been deleted, a man believed to be Mohamed Elomar offered $1,000 for information on the whereabouts of Dr. Jamal Rifi and his five children.

"Anyone in Sydney who can give me the details of Habashi dog Dr Jamal Rifi, anything, house details, wat area am willing to pay $1000," the tweet said.

Rifi is a general practitioner and outspoken community leader who this week condemned shocking images posted on social media by convicted terrorist Khaled Sharrouf of his seven-year-old child holding a mutilated head.

In 2009, Sharrouf was jailed for his role in a planned terror attack in Australia led by Mohamed Ali Elomar, the uncle of the man believed to have offered the bounty.

However, Rifi said he refused to be silenced.

"I'm not going into hiding. I know I'm fortunate enough to life in a country where law and order prevail and people can't take matters into their own hands, and affords me the freedom to speak. And I want to use that privilege to defend what we have in Australia and to keep it."

In a direct message to Elomar, Rifi tweeted: "to know my address just ask your dad, we were in the same soccer team then and we still Best mates and he knows I am and never been a HABASHI."