Early Friday morning, local time, Israel launched what it is calling a "preemptive strike" against Iran and declared a state of emergency, according to Defense Minister Israel Katz.

"Following the State of Israel's preemptive strike against Iran, a missile and drone attack against the State of Israel and its civilian population is expected in the immediate future," Katz said in a statement.

Air raid sirens sounded in Tel Aviv following the announcement.

The U.S. did not provide any assistance or have any involvement in the Israeli strike, a U.S. official told ABC News.