Firefighters are reminding members of the public about the dangers of fire-setting.
Crews have attended a significant number of wildfires in the Gramps area of Aberdeen during the past month.
Police Scotland says it is “keeping an open mind” but encouraging members of the public with any information to suggest they might be wilful to get in contact.
Darren Riddell is the Scottish Fire and Rescue Service’s Group Manager for Aberdeen City.
He said: “We are presently working very closely with our partners at Aberdeen City Council and Police Scotland as well as local wildlife rangers to ensure the safety of our communities.
“There has been a large number of wildfires within a relatively short space of time and these can have a significant impact not only on the lives of local people but on our wildlife and our environment.
“There are numerous sites of historical importance on the Gramps - so it’s imperative that we work together to protect such areas.
“I would ask the community to assist in any way possible and that includes contacting Police Scotland with any information they might have in relation to these fires.”
GM Riddell added: “I would like to thank our partners and indeed our firefighters for their efforts throughout these incidents.
“It has been a serious combined effort to protect our communities.”
Torry Community Policing Team Sergeant Jonathan Spence confirmed Police Scotland is investigating in relation to a fire at Nigg Bay Golf Club which was reported on Monday, September 17.
He said: "It goes without saying how serious the consequences of fire can be.
“We are carrying out additional patrols in the area as well as working to support our colleagues at the Scottish Fire and Rescue Service.
“Wilful fire-raising is a serious offence and we would encourage anyone with concerns or information to contact us as soon as possible."
Sergeant Spence added: "In relation to the recent fires at the Gramps we are keeping an open mind and would encourage anyone who has any information suggesting they may be wilful to contact police.”
Anyone with information should contact police on 101 - using reference number CF0228360918 - or Crimestoppers on 0800 555 111 to remain anonymous.