<p>WASHINGTON (CNN) -- A 15-count, $1 trillion lawsuit was filed Thursday in the U.S. District Court for the District of Columbia by more than 500 relatives of people who died in the September 11 attacks.</p>
<p>Calling themselves Families United to Bankrupt Terrorism, they are suing seven international banks; eight Islamic foundations, charities and their subsidiaries; individual terrorist financiers; the Saudi bin Laden Group; three Saudi princes; and the government of Sudan for allegedly bankrolling al Qaeda, Osama bin Laden and the Taliban.</p>