Residents are returning to their houses this morning following a P lab explosion that has injured at least one man.
Police have confirmed they are dealing with a P lab.
"We believe the lab was operational at the time of the explosion'', said inspector Karl Wright-St Clair.
The investigation is focussing on the basement, and the police officers who arrived first at the scene have gone through a decontamination process.
At least a dozen residents were evacuated, although some of them have now returned to their homes and police may shrink the cordon soon.
Mr Wright St-Clair said two men were at the house at the time of the explosion.
The injured man has serious burns to his upper torso and head area, and has been transferred to Waikato Hospital.
No arrests have been made.
Many residents said they did not hear the explosion, although a neighbour said he heard a compressor begin early this morning.
