A flare let off in a Christchurch neighbourhood that landed on a house has caused extensive damage expected to take "several months" to repair.
Police were appealing for information about the incident that occurred on Saturday, August 31, at about 10pm in the Redwood/Casebrook area.
"The flare caused a lot of damage to the roof, trusses, ceiling and flooring when it landed," Constable Stephanie Gemmill said.
"The work involved to repair the damage is expected to take several months."
The flare was a parachute rocket red flare, designed for use on a yacht or life raft.