A man is seriously injured after an explosion at an industrial site in Rangiora, Canterbury.

A police spokeswoman said the man was injured shortly before 8am when a drum exploded at a site on Flaxton Rd.

St John Ambulance treated the man and took him to Christchurch Hospital with serious injuries.

The police spokeswoman said Worksafe would be notified.

The accident happened on Flaxton Rd, Rangiora, about 7.50am. Image / Google Maps