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Sequences of seismic events affect both the spatial distribution of earthquakes and their distribution over time. It is necessary to know the statistical characteristics of the different series and to reflect their impact in general research related to seismicity. In the study, we analyzed the observed sequences of swarm type in the region of the town of Simitli. The earthquakes (277 event) with magnitude MP≥2.2 from the series are clustered in the area southern to the town of Simitli. Temporal distribution of earthquakes near the town of Simitli (in the area with radius 15 km) shows sharp increase in the number of earthquakes about 600 days after January 1, 2022. Thus, it can be assumed that the start of the swarm is at the beginning of September 2023.