More than a year of Israel's war against Hamas in Gaza has killed more than 43,000 people, Palestinian health officials say.
An additional $4.86 billion has gone into stepped-up U.S. military operations in the region since the attacks.
Israel and the United States have warned there would be severe consequences if Iran attacks.
Israel advised people to evacuate to the north of the Awali River, about 36 miles from the border and much farther than the Litani River.
An explosion in southern Gaza killed eight Israeli soldiers, the military said Saturday, making it the deadliest attack on Israeli forces in months.
The Israeli military has confirmed the deaths of four more hostages held by Hamas -- including three older adults seen in a Hamas video.
Israel's military had earlier said that it launched an investigation into civilian deaths after it struck a Hamas installation.