In the Campaign Booklet, each square on a Map containing a is considered a Restricted Area. Any Assassin who enters a square containing a Restricted Area token AND 1+ Enemies automatically becomes exposed (without Detection Test) and the Alert is triggered as usual.
Likewise, when 1+ Enemies enter a square with a Restricted Area token containing 1+ Bodies/Assassins/Allies, they become automatically exposed (even if they are in a Hiding Spot) and the Alert State becomes .