Iran's central bank announced plans to challenge a U.S. lawsuit to seize $1.7 billion in Iranian assets held by the Luxembourg-based Clearstream, a unit of German stock exchange operator Deutsche Boerse. U.S. authorities have spent several years investigating whether Clearstream violated U.S. money laundering and Iran sanctions laws. In 2019, a Luxembourg court declined to act on a ruling by a U.S. court that would have enabled the families of U.S. citizens affected by terrorism to claim Iranian assets held by Clearstream. Deutsche Boerse has denied wrongdoing and intends to challenge the U.S. claim to the Iranian assets.