Under U.S. law, foreign governments can be held liable, in some circumstances, for deaths or injuries caused by acts of terrorism or by providing material support or resources for them.
The 1976 statute cited in the lawsuit, the Foreign Sovereign Immunities Act, is a frequent tool for American plaintiffs seeking to hold foreign governments accountable. In one example, a federal judge in Washington ordered North Korea in 2018 to pay $500 million in a wrongful death suit filed by the parents of Otto Warmbier, an American college student who died shortly after being released from that country.
People held as prisoners by Iran in the past have successfully sued Iran in U.S. federal court, seeking money earlier frozen by the U.S.