Garbage containers and dumpsters in the towns of Simrishamn, Hammenhög, Sjöbo and Smedstorp caught fire, according to local media reports.
Fire fighters first received a call just a few minutes before 1am about a dumpster that had caught fire in Simrishamn.
Word of more fires came in steadily until the last call came in at 3.49am about a garbage container in Sjöbo which was also in flames.
No one was injured in the fires, and as of Sunday afternoon, police still had no suspects.
“We don’t have much to go on,” said Ystad police spokesperson Stellan Andersson to the Ystads Allehanda newspaper.
One theory is that all the fires were set by a single assailant or group of assailants.
Andersson said, however, that there is nothing connecting the fires.
Seven police reports have been filed in connection with the fires and the matter has been classified as vandalism caused by fire.