A fire that has ripped through a well-known Christchurch heritage mansion overnight is being treated as suspicious.
Fire and Emergency New Zealand were called to Antonio Hall on Riccarton Rd after 3.30am and found it ablaze.
Antonio Hall is a Category 2 Historic Place and firefighters remain at the site today dampening down hot spots and the last of the flames.
Neighbours in the area were evacuated as 12 fire crews fought the blaze.