A teen who allegedly published Islamic State propaganda online and threatened to kill a Jewish congregation has been refused bail after a judge found he is a risk to the community.

The 18-year-old, who cannot be named for legal reasons, sat with his head in his hands as Victorian Supreme Court Justice Rowena Orr handed down her decision on Thursday afternoon.

He was in May charged by Australian Federal Police counter-terrorism officers with offences including publishing extremist material and using a carriage service to make a threat to kill.

Police arrested him after he allegedly sent an email under the name Adolf Hitler to the Melbourne Hebrew Congregation, claiming a shooter would attack the synagogue during Shabbat.

The same email also allegedly claimed there were explosives surrou

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