Israeli and American victims of Palestinian attacks sued Facebook Monday, claiming that the internet giant enables the militant Hamas group to use its platform and demanding $1 billion in damages.

The civil action was filed in New York by Israeli legal NGO Shurat Hadin in the name of family members of four Israeli-Americans and one US citizen killed since June 2014.

The plaintiffs say Facebook has knowingly provided its "social media platform and communication services" to Hamas in violation of the US Anti-Terrorism Act which prohibits US businesses from "providing any material support, including services, to designated terrorist groups and their leaders".

(AFP)