Isfahan.

This is coolbert:

Coverage the Iranian press the Israeli counter-strike Iranian targets! 

"Explosion heard near Isfahan due to activation of air defenses"

From https://www.presstv.ir | 19 April 2024.

"Explosions have been heard near the central Iranian city of Isfahan due to the activation of air defenses, informed sources say."

See the graphic as posted by Colonel Macgregor. Multiple targets hit Iran. Click on image on see an enlarged view.

"Initial reports say important facilities in the Isfahan province, especially nuclear facilities, are completely safe and no accidents have been reported.

"Following the activation of air defenses in some parts of the country to deal with possible targets, no large-scale hit and explosion caused by any air threat has been reported."

That biggest worry of all will be if Iranian atomic sites and facilities attacked

coolbert.