Iran has launched a new wave of missile attacks on Israel, triggering air raid sirens across the country as emergency services reported projectiles striking and shrapnel falling in Israel’s north and center,

The U.S. is assisting Israel in shooting down missiles targeting the country, a U.S. official confirmed to ABC News.

DUBAI, United Arab Emirates (AP) — Israel’s defense minister warned Saturday that “Tehran will burn” if Iran continues firing missiles, as the two countries traded blows a day after Israel launched a blistering surprise attack on Iranian nuclear and military sites, killing several top generals.

Israel and Iran have traded missile strikes for a third straight day. Israel on Sunday hit targets in Tehran including the Defense Ministry and sites it claims are tied to Iran’s nuclear program.

"This confrontation will not end with last night's limited actions and Iran's strikes will continue, and this action will be very painful and regrettable for the aggressors," Fars reported, citing senior military officials.