Fire crews are dampening down hot spots this morning after Christchurch's Port Hills were ablaze last night.
The fire raged across 1000 square metres of grass and tussock, while four fire trucks, five water tankers, and a Command Unit worked to control it.
Rural crews remained on-site overnight and this morning six firefighters are still in attendance. The fire is being treated as suspicious.
Fire Service spokesperson Brent Dunn says they received a 111 call at the beginning of the night saying fireworks had been set off and may have caused the blaze. He says crews have found empty fireworks canisters on the hill.
No properties were threatened however, strong winds contributed to the spread of the blaze. Flames could be seen from all over Christchurch.