A boy has been airlifted to hospital in a serious condition and two others injured after a three-car crash in Waikato this afternoon.

Emergency services were notified of the crash at the intersection of State Highway 2 and Pinnacle Hill Rd, Mangatawhiri, at 3.15pm today.

Auckland Westpac Rescue Helicopter was called to Mangatawhiri at 3.47pm.

Rescue helicopter paramedics assisted a boy who was flown to Auckland's Starship Hospital in a serious condition.

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Another patient, also believed to be in a serious condition, was transported to Middlemore Hospital by ambulance.

A third patient was in a minor condition and transportation to hospital wasn't required.

A boy who was in a serious condition was flown to Starship Hospital. Photo / Auckland Rescue Helicopter Trust
A boy who was in a serious condition was flown to Starship Hospital. Photo / Auckland Rescue Helicopter Trust

Helicopter pilot James Tayler said "the landing was very challenging between powerlines and lamp posts".

SH2 will remain closed until about 7pm tonight around Pinnacle Hill Rd, Mangatawhiri, police confirmed.

Police confirmed the Serious Crash Unit has been advised.

Motorists are urged to avoid the area and warned to expect delays.