Police are calling for public assistance following a suspicious fire on Hanson St in Wellington on Sunday.
One person was taken to hospital after two properties were destroyed, and another two badly damaged by the major fire.
Detective sergeant Steve Wescott said several witnesses have come forward, and police has since seen CCTV footage, which shows two people leaving the address separately shortly after 10.30pm.
"On arrival, police located one injured person outside and were made aware
the property was on fire."
He said staff will remain on site for the next few days as an examination of the scene continues.