Three people have been injured after a gas canister exploded at an air show in Marlborough.
More than 30,000 people are expected to attend the Classic Fighters Air Show at Omaka, near Blenheim over three days from Friday.
St John Ambulance said it was called to the event on Friday evening after a small camping gas cooker cylinder exploded.
A spokesperson says a man in his 50s is in a serious condition in Wairau Hospital.
A 46-year-old woman and a man, aged 34, with burns to their face and neck were also taken to hospital.
Motels, backpackers and holiday houses are all full as fans of vintage and military aircraft gather to watch the displays.
The theme for the air show is based around American culture during World War I and II and its impact on other cultures.
War planes, as well as American military machines and weaponry will take on German war machines including a rare Tiger tank and a secret weapon.
The New Zealand Air Force will showcase two new helicopters, as well as a display by its Red Checkers aerobatics team.
Squadron Leader Jim Rankin says the team enjoys the opportunity to showcase its skills and it's a great opportunity to attract new talent to the Air Force.