TEL AVIV, Israel - Israel has suffered casualties as Iran fights back from the Jewish state's unprecedented unilateral attacks which began in the early hours of Friday morning.

Late Friday night Iran launched scores of drones and missiles at Israel, however most were intercepted, or failed to reach their targets, according to the Israel Defense Forces (IDF).

Explosions have been seen in Tel Aviv. CNN are quoting U.S. officials as telling them the United States is assisting Israel in responding to the drone and missiles barrage.

No deaths have been reported so far, however The Jerusalem Post says 42 people have been wounded in the attacks, while the condition of two of them is said to be critical.

According to the IDF, less than 100 projectiles were fired at Israel, and there were only "a few hits."

Sirens were sounded across Israel as the Iranian retaliatory attack began. 

Photo credit | AVSHALOM SASSONI/MAARIV

'Magen David Adom has provided medical treatment to 21 wounded individuals, including one who was seriously wounded, two who were moderately wounded, and 18 who are lightly wounded and are having anxiety attacks,' The Jerusalem Post reported..

Earlier Iran's supreme leader vowed to respond to the Israeli attacks. "Strong action should be taken, and will be taken," Ayatollah Seyyed Ali Khamenei said in a televised address to the nation.. "We will have no leniency on them. Life will undoubtedly turn bleak for them,," he said.

The Islamic Revolution Guards Corps (IRGC) said in a statement shortly before midnight Friday, that the Iranian force's missile and drone units had targeted the Israeli military bases that had been used to initiate the strikes on Iran, as well as industrial weapon manufacturing and other military sites deep in Israel. The statement said intelligence collected, including through satellite imagery, showed dozens of ballistic missiles had hit their targets.