Businesses in Dundee have been forced to invest in additional security as fireraisers have struck across the city in recent months.
Police Scotland has also upped patrols in certain areas in an effort to prevent further incidents.
More than 20 deliberate fires were started during the third quarter of 2015-2016, which is above the five-year average.
Senior managers at the Scottish Fire and Rescue Service have been working with local partners in an effort to identify those responsible.
They are urging the public to be vigilant, asking parents to keep an eye on the activities of their children and the public in general to look out for and report “strangers loitering” in their streets.
The SFRS is also keen to see the public report incidents of flytipping or the build up of rubbish that might prove a tempting target.
Incidents included in Scottish Fire and Rescue’s latest quarterly report include nine vehicles burned and five fires started at residential properties, jeopardising the safety of occupants.
Six further fires took hold within industrial premises, a hospital and in a theatre, while a garden shed and private garage were also targeted.
The report also details 109 deliberate secondary fires, including 41 wheelie bin fires.
The largest number of such incidents, 44, related to small outdoor fires, including those involving scrubland and grass.
Scottish Fire and Rescue said significant steps had been taken to address the issue, including working closely with the council in the hope of reforming young firestarters.
A number of youths are undertaking the SFRS’s Fire Setters intervention programme, which aims to educate youths against the dangers of fire setting.
SFRS Local Senior Officer for Dundee, Perth and Kinross and Angus, Colin Grieve, is keen to ensure the problem does not get out of hand.
He said: “Unfortunately, this time of year traditionally sees an increase in the number of deliberate fires across the country.
“These incidents range from rubbish and refuse fires to vehicles being set ablaze.
“In the north of Dundee, SFRS has also noted a significant amount of grassland fires due to favourable weather drying out long grass that has not started growing yet.
“Unfortunately young people are often caught unawares by the speed at which grass fires spread and change direction with the wind.
“These fires often spread to fences, garages and other property, while causing significant problems for householders and traffic due to the volume of smoke produced.”