The United States leveled visa restrictions against 14 Iranian nationals who were allegedly involved in the 1990 assassination of a prominent Iranian dissident in Switzerland.

The announcement came on Friday, which coincides with the United Nations’s Day of Remembrance and Tribute to the Victims of Terrorism. The move denies the 14 individuals — only one of whom, Hojatollah Khodaei Souri, was named in the announcement — entrance into the U.S. The ban also includes their immediate family members.

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