The Venezuelan gang Tren de Aragua has expanded to at least 16 U.S. states, impacting half of America’s population, as reported by the New York Post. An internal memo from Homeland Security warns of Tren de Aragua’s growing presence, specifically in Washington, DC, Virginia, Montana and Wyoming.

The memo indicates that the gang’s arrival correlates with “increases in migrant populations” in the regions it has penetrated.

The man accused of killing Georgia nursing student Laken Riley is listed as an active member of the gang, according to the Post