The cause of the fire was arson. The property in which the arson was committed is multi-occupancy residential property and the fire potentially could have harmed a number of people.
The fire was started at around 9:30am and Police are keen to speak to the two people shown in these CCTV stills.
A 20 year old man was arrested in connection with the incident but released without charge.
Anyone with any information is asked to contact police. Dial 101, press 2 and ask to speak to DC Kirsty Graham in the Harrogate Serious Crime Team.
Alternatively, Crimestoppers can be contacted anonymously on 0800 555 111.
Please quote reference number 12150215696 when passing on any information in relation to this incident.