Key Points:

Police reported a "massive disturbance" as they blocked off Auckland's Northwestern motorway while they dealt with two serious incidents tonight.

Inspector Willie Taylor of the northern communication centre said police had stopped traffic between Te Atatu and Rua Rd while they dealt with a "very delicate situation" from about 6.15pm till 7.30pm.

Mr Taylor said the traffic disruptions were compounded by diversions around a serious crash on State Highway 16 at Kumeu after two cars collided, leaving an elderly man with serious injuries.