Israel's Magen David Adom emergency service said its responders treated four people who sustained shrapnel injuries in the north of the country on Sunday morning, as Hezbollah and the Israel Defense Forces continued intense cross-border strikes.

Among those reported injured were a 76-year-old male "in moderate condition from a shrapnel wound to the upper body," as well as a 16-year-old female "in mild condition," the MDA said in a post to X.

Both were injured in the Krayot region near the northern city of Haifa, less than 20 miles from the border with Lebanon.

Several other people were "mildly injured" or "suffering from anxiety" while heading to safe areas and shelters in northern Israel, the MDA said.

-ABC News' Jordana Miller

The Israel Defense Forces has issued new defensive guidelines for the north of the country amid intensifying cross-border fire by the Hezbollah militant group and a ramped up IDF strike campaign in southern Lebanon and Beirut.

Outdoor gatherings must now be limited to 10 people and indoor gatherings at 100 people, the IDF said in its new guidance.

Beaches will be closed and all educational activities "prohibited," the force said. Work activities can continue if workers are within reach of a protected space.

-ABC News' Anna Burd

The U.S. State Department reissued its level 4 "do not travel" warning for Lebanon Saturday to include threats posed by "recent explosions throughout Lebanon, including Beirut."

The Department’s prevailing guidance for American citizens in the country—which is to "depart Lebanon while commercial options still remain available"—is unchanged from its last advisory issued in July.

"At this time, commercial flights are available, but at reduced capacity. If the security situation worsens, commercial options to depart may become unavailable," the advisory said.

-ABC News' Shannon Kingston

Israel's chief military spokesman Brig. Gen. Daniel Hagari addressed the ongoing escalation between Israel and Hezbollah, saying in a statement Israel is currently conducting more strikes in Lebanon and has struck 400 “targets” on Saturday alone.

He also announced a change to defensive readiness for Israelis in Haifa and north of Haifa. They must now always be able to reach a shelter quickly and gatherings are limited to 300 people indoors and 30 people outdoors.

Asked about a possible ground invasion of Lebanon, he would only say, "Our mission is to return the residents of the north safely to their homes and for that we will do whatever it takes."

Hagari also addressed Gaza and said Israeli forces killed militants they believe were holding Hersh Goldberg-Polin and other hostages who were found dead last month.

-ABC News’ Anna Burd