Israel and Iran exchange missile attacks for a third day; nuclear sites hit, death tolls rise, airspace shut, U.S. warns Tehran against retaliation.

Iran fired a new wave of missile attacks on Israel early Monday, triggering air raid sirens across the country as emergency services reported at least five killed and dozens more wounded in the fourth day of a conflict between the regional foes that showed no sign of slowing.

The war between Israel and Iran is in its fourth day, with Israel striking at military sites and Iran's nuclear program and Iran firing missiles in retaliation

Iran has vowed to retaliate against the U.S., too, while Trump has warned: “If we are attacked in any way, shape, or form by Iran, the full strength and might of the U.S. Armed Forces will come down on you at levels never seen before.” Here’s what to know about U.S. involvement so far.

President Donald Trump said the United States is not involved in the conflict between Iran and Israel, but as the archenemies launched a fresh barrage of air strikes at each other, he admitted it's "possible" that will change.

President Donald Trump said Sunday the United States is not involved in Israel's military strikes against Iran, but "it's possible we could get involved." In an interview with ABC News' Rachel Scott,

President Donald Trump on Sunday issued a stark warning to Iran against retaliating on U.S. targets in the Middle East while also predicting Israel and Iran would “soon” make a deal to end their escalating conflict.

The conflict, the most intense fighting between the two countries in decades, has been met in the United States with feelings of “frustration and helplessness,” as well as heartbreak.