Missiles have been launched from Iran toward Israel and sirens are sounding across the country, according to a statement from Israel’s military.

Earlier on Tuesday the White House warned that Iran was poised to launch a ballistic missile attack on Israel soon, instantly ratcheting up fears of all-out war in the region.

In a statement released mid-morning, the White House said it had “indications that Iran is preparing to imminently launch a ballistic missile attack against Israel,” adding the United States was “actively supporting defensive preparations to defend Israel against this attack.”

“A direct military attack from Iran against Israel will carry severe consequences for Iran,” a senior White House official said in a statement.

Israel assessed that Iran was likely to attack three Israeli air bases and an intelligence base located just north of Tel Aviv, a person briefed on the matter said.

The intelligence base in Glilot was evacuated Tuesday afternoon, the person said, and the Israeli military has put contingency plans for the safety of personnel at those bases into effect.

The US warned Israel that an attack would likely come within the next 12 hours, the person said.

An Israeli source told CNN shortly after the White House’s warning that intense diplomacy is happening behind the scenes.