A self-proclaimed white supremacist was arrested outside Christchurch's Linwood Mosque this morning.

The Christchurch Mosque gunman's sentencing for the March 15 attacks is continuing today at the High Court in Christchurch.

45-year-old Philip Arps - who used to own a Nazi-themed insulation company - was jailed for 21 months last year for sharing modified footage of the killer's livestream.

He was released in late January with strict conditions - which included not going near Christchurch's two mosques or having contact with Muslim people.

Arps was arrested this morning and charged with breach of release conditions.

His lawyer Anselm Williams says he's appeared in the Christchurch District Court where he's pleaded not guilty - and has been released on bail