Iran and Israel continued on Sunday their aerial attacks, which began Friday with a series of Israeli strikes on Iran.

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

While the U.S. insists it is not involved in strikes on Iran, American officials have confirmed military forces have been helping to intercept Iranian missiles fired at Israel.

President Donald Trump rejected an Israeli plan in recent days to kill Iran's Supreme Leader Ayatollah Ali Khamenei, two U.S. officials told ABC News. The officials stated that Israel shared with the United States that they had a window to kill Iran's leader but the president was not on board with the plan.

Spokane-born retired American diplomat Ryan Crocker anticipates the conflict between Israel and Iran will escalate in the coming days.

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.

The death toll grew Sunday as Israel and Iran exchanged missile attacks for a third consecutive day, with Israel warning that worse is to come.