An explosion was reported near the 15 Khordad base in Isfahan Province, Iran, at 19:50 local | 1620Z, followed by a column of smoke.

After reviewing an image from the area, Shin (@hey_itsmyturn) wrote:

Judging by the image I got, something blew up for sure, smoke is big-ish, doesn't look like UXO disposal operation at all.

The original report was published through FromIran with a 120-second delay:

https://fromiran.sh1n.org/incidents/SxshNxCEdNHMdf7I3Vm11O-I