Neo-Nazi leader Thomas Sewell arrested during counter-terrorism raid on Melbourne home

Leader of neo-Nazi group National Socialist Network Thomas Sewell has been arrested during a counter-terrorism raid at his home in Melbourne's southeast.

The 28-year-old was arrested along with a 22-year-old man at a Rowville property early this morning.

Mr Sewell posted "getting raided" on social media just before 5am today, before being escorted out of his home by police on a loudspeaker.

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Police in a statement said the arrests follow an alleged armed robbery at the Cathedral Range State Park in Taggerty, the state's north-east, last Saturday.

Investigators allege a group of men smashed a car window and threatened the passengers inside with a knife, before making off with their mobile phones.

No charges have been laid and the investigation remains ongoing, police said.

Mr Sewell had been on bail after being charged over a separate alleged violent attack on a security guard at Channel 9's Melbourne headquarters in March.

The man allegedly punched the security guard multiple times outside the television network's headquarters in Docklands.

The alleged assault was captured on video by Mr Sewell's associate and later posted online.

He was charged with affray, recklessly cause injury and unlawful assault over the attack.