Firefighters say they were gutted to learn a blaze north of Christchurch was sparked by fireworks.
By last night, the fire had burned through more than 180 hectares of pine forest and scrub along a five-kilometre stretch of beach from Pegasus to Woodend.
Police have spoken to two young people, one of whom has been referred to Youth Aid.
Fire and Emergency incident controller Graeme Knight told Corin Dann the fire hasn't grown in size, but there are still days of work ahead.
