Traffic builds up southbound on State Highway 1, Auckland, as a police operation closes off a section of motorway in Highbrook. Supplied photo

A section of the Southern Motorway is closed due to an “ongoing operation”, police say.

The southbound lanes of State Highway 1 were initially closed between Princes St East and Highbrook Drive in Highbrook.

Just before 1pm the cordons were extended, with the southbound lanes of SH1 closed between Mt
Wellington Highway and Highbrook Drive, NZTA wrote on X.