The Department of Homeland Security has identified more than 600 migrants in the U.S. who may have connections to a notorious Venezuelan gang that is drawing growing concern from local and federal law enforcement officials, according to data obtained exclusively by NBC News.

Roughly 100 of the 600 migrants DHS has deemed “subjects of interest” were confirmed members of the gang whom the department recommended be placed on an FBI watchlist, officials said. The others could be found after a review to be victims, witnesses or members of the gang.