A 7-year-old boy suffered serious injuries in a fall from a motorcycle in Otago this evening.

The incident happened about 44km north of Dunedin, near Waikouaiti.

A St John spokesman said the ambulance service was alerted at 6.33pm.

"We sent the Otago rescue helicopter with St John paramedics on board and an ambulance to the scene, which was a private residence on Ramrock Rd near Bucklands Crossing."

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The boy was flown to Dunedin Hospital emergency department in a serious condition.

A Fire Service spokesman said firefighters helped ambulance staff to prepare a landing zone for the helicopter.