The families of American citizens killed in Yemen by U.S. drone strikes in 2011 cannot sue the federal government, a federal judge in Washington ruled Friday.

The missile strikes killed suspected terrorist Anwar Al-Aulaqi, an American citizen, along with two other Americans, Al-Aulaqi’s 16-year-old son Abdulrahman Al-Aulaqi and Samir Khan. In a complaint filed by the elder Al-Aulaqi’s father and Khan’s mother in the U.S. District Court for the District of Columbia in 2012, they accused the federal government of violating the Americans’ Fourth and Fifth Amendments rights.