Iran launched missiles and drones at Israel in separate barrages overnight Friday in response to airstrikes less than a day earlier that targeted nuclear sites and top commanders in the Islamic nation.

Although Iran maintains that its nuclear program is for peaceful energy purposes, Israel has long seen it as a threat. Israeli strikes have hit three of Iran’s nuclear facilities — Natanz, Isfahan and Fordow. Little damage appears visible in satellite imagery of Fordow.

Explosions were heard in the Iranian capital, Tehran, as Israel launched a preemptive strike. Israel is under a state of emergency, as Iran retaliated Friday night with missile attacks.