JERUSALEM - Sirens sounded across central, northern Israel and Israel-controlled Jerusalem as Iran launched a new wave of ballistic missiles.

Israelis in affected areas were instructed to remain in bomb shelters.

It marked the first Iranian ballistic missile strike on Israel in over a day -- and the first since the United States attacked Iran's three nuclear facilities.

Israel closed its airspace in an apparent precautionary measure following the US strike on Iran's nuclear facilities, the Israel Airports Authority announced earlier.

A statement from the Israel Defense Forces said with the approval of the Defense Minister Israel Katz, and following the situational assessment, it was determined that as of Sunday at 03:45 am (0045 GMT), immediate changes will be made to the Home Front Command instructions.

As part of the changes, it was decided to shift all areas of the country from Partial and Limited Activity to Essential Activity. The instructions include a prohibition on educational activities, gatherings and workplaces, except for essential sectors, said the statement.

US President Donald Trump said earlier on Saturday that the United States has completed attacks on three nuclear sites in Iran, namely "Fordow, Natanz and Esfahan."