The road has reopened after a crash saw two people injured, one critically, on State Highway 1 near Tokoroa.

Emergency services were called to the scene of the two-car crash about 5.45am. The crash happened at the intersection of State Highway 1 and Puriri Rd.

One person had been flown to Waikato Hospital in a critical condition, while another was taken by road in a serious condition, a St John spokesman said.

NZ Transport Agency said a small section of the highway would be closed for some time as police conducted an investigation into the crash.

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The road was reopened about 10.30am.