Fraser Anning in a written statement.
The teenager has been released pending further enquiries, national media outlet Nine News said.
Footage of the incident shows a 17-year-old boy calmly walk up behind the Senator, pull out his phone and start recording before smashing an egg over his head in protest of the controversial comments.
The senator turns, swears and retaliates by hitting the youth's face before he is restrained by a man nearby.
Several of Anning's supporters intervened tackled the boy to the ground while the Senator slipped out a side door.
"Earlier today I called Senator Anning and asked him not to make any public comment today", Mr Dutton said on Twitter.
World leaders have condemned the actions of the terrorists, at least one of whom is believed to have been from Australia.
"This act of terror on innocent worshippers is an atrocity and we grieve with the victims and their families", Dr Jneid said in a statement on Friday.
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He had published a statement yesterday blaming Muslim immigration for the Christchurch shooting in New Zealand which claimed 49 lives. This just so happened to go down, as the event was being live streamed on Facebook.
Singapore's Home Affairs and Law Minister K. Shanmugam said that the comments by senator Fraser Anning described Islam as a violent, fascist religion promoting savage beliefs.
Fraser also tweeted a number of Islamophobic messages on Friday in the hours after the attack. It is completely unacceptable.
"While they may be words, words create a certain environment, they embolden certain people, they give them a platform or a sense of confidence that they can do certain things", he said.
Australian PM Scott Morrison has announced the Coalition and Labour would pass a motion in the next parliament meeting in April to censure Anning.
'Those views have no place in Australia, let alone the Australian Parliament'.
Former Prime Minister Malcolm Turnbull echoed the sentiment.
'He is a disgrace to the Senate and what is worse by spreading hatred and turning Australians against each other he is doing exactly what the terrorists want'.