The US military has hit a large ammunition depot in Isfahan, The Wall Street Journal reports.
According to the publication, the strike on the city, located in the central part of the country, was carried out at night and involved the use of a large number of 900-kilogram bombs.
Al-Hadath TV also reported "several explosions" in Isfahan.
According to the TV reports, the city was hit by airstrikes.
Several powerful explosions occurred in the western part of the Iranian capital Tehran, the Jamaran news agency reported.
Details were not provided.