JERUSALEM — Israeli police made dozens of arrests on Sunday as tens of thousands of protesters demanding a deal to free hostages in Gaza aimed to shut down the country in one of the largest and fiercest protests in 22 months of war.

Groups representing families of hostages organized the demonstrations, and gave an even larger estimate of attendees, as frustration grows in Israel over plans for a new military offensive in some of Gaza's most populated areas. Many Israelis fear that could further endanger the remaining hostages. Twenty of the 50 who remain are believed to be alive .

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