Israel carried out a predawn missile strike inside Iran on Friday local time, U.S. media reported, citing unnamed U.S. officials.

The reports by networks ABC, CBS and NPR did not provide further detail about the location or target of the apparent missile strike.

A spokesperson for the Israeli military told VOA he had no comment “at the moment” on the U.S. media reports, about an hour after the reports emerged.

Iranian state news agency IRNA said the Islamic republic’s air defenses had been activated in the skies over several provinces.

Both IRNA and state news agency Fars, affiliated with Iran’s Islamic Revolutionary Guard Corps, cited unnamed news sources as saying there had been an explosion in Iran’s central province of Isfahan.

Fars located the explosion in the city of Qahjaverestan, on the eastern outskirts of Isfahan city.

Israel had warned Iran that it would retaliate for an unprecedented Iranian aerial assault on Israeli territory last Sunday.