Lawyers filed a $1 billion lawsuit against Facebook Inc., alleging it allowed the Palestinian militant Hamas group to use the platform to plot attacks that killed four Americans and wounded one in Israel, the West Bank and Jerusalem.

“Facebook has knowingly provided material support and resources to Hamas in the form of Facebook’s online social network platform and communication services,” making it liable for the violence against the five Americans, according to the lawsuit sent to Bloomberg by the office of the Israeli lawyer on the case, Nitsana Darshan-Leitner.

“Simply put, Hamas uses Facebook as a tool for engaging in terrorism,” it said.

Hamas is considered a terrorist organization by the U.S., European Union and Israel. The suit said the group used Facebook to share operational and tactical information with members and followers, posting notices of upcoming demonstrations, road closures, Israeli military actions and instructions to operatives to carry out the attacks.

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