Two C-130 aircraft were lost during the operation, an official said.
President Donald Trump announced "major combat operations" against Iran on Feb. 28, with massive joint U.S.-Israeli strikes attack targeting military and government sites, officials said.
Watch special coverage on Nightline, "War with Iran," each night on ABC and streaming on Disney+ and Hulu.
The Lebanese Ministry of Public Health said in an update on Sunday that 1,238 people have been killed since the start of the war in Lebanon, with 3,543 people injured.
The health ministry said 49 people were killed on Sunday, with 116 injured.
A United Nations peacekeeper was killed over the weekend "when a projectile exploded in a UNIFIL position" in Southern Lebanon, according to the organization. Another peacekeeper was critically injured.
UNIFIL, the U.N. Interim Force in Lebanon, said it does not know where the projectile originated from, and an investigation is ongoing.
"Too many lives have been lost on both sides of the Blue Line in this conflict. There is no military solution. The violence must end," UNIFIL said.
-ABC News' Victoria Beaulé
More than a month into the war with Iran, President Donald Trump told reporters on Air Force One Sunday that negotiations with the country are still ongoing, “directly and indirectly,” and that he could “see a deal” with the country coming through “soon.”
"I do see a deal in Iran, yeah. Could be soon," he said.
However, he also acknowledged that “it’s possible we won’t” come to a deal and added, “you never know with Iran.”
Asked if he is still considering boots on the ground and if he would consider doing so without Congressional approval, Trump did not reply yes or no, instead insisting that he has “lots of alternatives.”
“I just have lots of alternatives. We have tremendous numbers of ships over there. We don't need them all because of, you know, the power,” Trump said.
-ABC News' Megan Mistry and Emily Chang
