American victims of the Hamas-led attacks on Israel on Oct. 7, 2023, and their families filed a lawsuit on Thursday against the Palestinian militant group and others they said “planned and perpetrated” the assault, seeking at least $7 billion in damages.

The lawsuit, backed by the Anti-Defamation League (ADL), claims that Hamas and six militant groups carried out the “unfathomable atrocities” with “material support” from Iran, Syria, North Korea and Hezbollah, a Lebanese militant group.

Some 1,200 Israelis were killed and another 250 were taken hostage. Those victims include the more than 140 U.S. citizens and their family members who are plaintiffs in the case, according to the lawsuit.

“The terrorists were not an independent band of marauders,” the lawsuit alleges. “They were organized death squads deployed by their terrorist organizations, and supported,........

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