Mosques, synagogues and churches across Australia are inviting the public to gather tonight to pray for a peaceful resolution to the siege in a show of multi-faith unity.

Sydney's Muslim community say they are horrified by the cafe siege and deeply concerned about individuals using spiritual realities for their "misguided political agendas".

The UN Alliance of Civilisations' Aftab Malik, who also works as a scholar-in-residence at the Lebanese Muslim Association in Lakemba in south-west Sydney, said he was shocked by what has taken place.

"My reaction is one of shock, horror, aversion and of deep concern," Malik said."I feel the Muslim community has been facing a series of unfortunate events."

Pic: A rabbi, an Islamic preacher and a Christian priest hold hands in solidarity over the Sydney cafe siege.