Lebanon's health ministry says 21 people have been killed in an Israeli strike in northern Lebanon.
This would be the first time Israel has targeted the Christian-majority northern region in a year of hostilities.
Israel is yet to comment.
The Lebanese health ministry said 51 people were killed by Israeli strikes across the country on Sunday.
In Gaza, Hamas-run authorities say an Israeli attack on a school used as a shelter killed 22 people on Sunday, including 15 children.
The UN agency for Palestinian refugees says the building was meant to be used to administer polio vaccines.