A sleeper cell consists of secret agents who receive specialised training in their home countries or states and are then "assigned" to assimilate themselves into the targeted country's or area's culture and society.
These sleeper agents may spend years as faceless people, including as students or traders, till they suddenly receive orders from their overseas handlers to either commit an act of terrorism or provide aid to those carrying out the act.
Individual members of a sleeper cell may not even be aware of each other - a vital way of protecting the identity of the others during police interrogations.
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