A loud blast was reported in northern Isfahan, Isfahan Province, Iran. The reason for the blast remains unclear.

In a follow-up, Shin (@hey_itsmyturn) reported:

Eyewitnesses say the explosion did not sound like the previous UXO disposals.

The initial report was published through FromIran with a 120-second delay: https://fromiran.sh1n.org/incidents/zriuwQTWqfGdDruKI5Eg7lDo