Sleeper cells in the U.S. have been a legitimate concern since multiple groups of terrorists used planes to fly into the World Trade Center and the Pentagon. Talk about possible sleeper cells has ...

(NewsNation) — As tensions escalate between the United States and Iran, the threat of sleeper cells has “never been higher,” according to U.S. Customs and Border Protection, although no specific or ...

Iran's sleeper cell threat in the U.S. after military base attack: Did Trump act on G7 intel? The story around Iran’s sleeper cell threat in the U.S. has turned urgent after Iran launched a missile ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. In a memo obtained by NewsNation, CBP ...