Police are asking the public for help following a suspicious fire in Rotorua on Sunday.

"An investigation is underway after Police and FENZ responded to a suspicious fire involving a car and a building, on Amohau Street at around 5.45am yesterday," says a police spokesperson.

Police would like to hear from anyone who saw a person leaving the area of Rotorua Brass Band and Shambles Theatre - near the Pak ‘n' Save carpark - on Amohau Street, between 5.30am and 6.00am on Sunday October 2.

"Please contact Police via our 105 phone service or online at www.police.govt.nz/use-105 using ‘Update My Report', referencing file number 221002/0803."

Information can also be provided anonymously via Crime Stoppers on 0800 555 111 or www.crimestoppers-nz.org