A critically injured man has been on a road in Northland.

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Police attended the “serious incident” on Paihia Rd near Opua about 4am on Saturday.

The man was found lying on the road about a kilometre south of the intersection with Te Raupo Rd.

A police spokesperson told Stuff it was not clear whether the man had been involved in a crash.

Paihia Rd is closed, and a detour is being put in place via Oromahoe Rd and Whangae Rd.

“The Serious Crash Unit has been advised, and investigations are underway into exactly what happened,” police said in a statement.