The Armed Offenders Squad led a police search of the suspected North Shore P lab.

The police Armed Offenders Squad temporarily blocked off a main road on Auckland's North Shore on Tuesday morning.

A police spokesperson said the squad was "executing a search warrant" on a suspected P lab or 'clan lab'.

Albany Highway was closed between Sunset Rd and Upper Harbour Highway.

GOOGLE MAPS A police operation has closed Albany Highway between Sunset Rd and Upper Harbour Drive.

Traffic diversions were in place but Auckland Transport announced the road section is now reopened.

Update: Albany Hwy is now open following a police operation. Please expect delays in area as congestion eases. ^LC — Auckland Transport (@AklTransport) June 20, 2016

Traffic cameras showed traffic was bumper to bumper in the area.