Five American photojournalists sued the Department of Homeland Security, alleging the U.S. government violated their First Amendment rights by tracking, detaining, and investigating them for reporting on conditions at the southern border last year.

The American Civil Liberties Union announced Thursday a lawsuit against acting DHS Secretary Chad Wolf and other department officials for how Customs and Border Protection officers in San Diego, California, carried out an “unprecedented, coordinated attack on the freedom of the press” late last year and into 2019.