Both Iran and Israel said they were targeting each other’s nuclear research and development facilities as the war between Iran and U.S.-Israeli forces stretches into its fourth week.

The continued strikes between Iran and Israel come after Tehran claimed that the Natanz Nuclear Facility had been hit by an airstrike early Saturday. Iran blamed the strike on a joint U.S.-Israeli attack, but Israel has denied conducting the strike on Natanz. The Pentagon also did not comment on the Natanz strike when reached by the Washington Examiner.