%minefield%

n. 1. (Mil.) a region in which explosive mines{ 4 } have been placed, especially a region on land. [ WordNet 1.5 ]

2. Hence: (Fig.) A situation in which a simple mistake can have disastrous consequences; a touchy or dangerous situation requiring great caution; as, the candidate threaded his way skillfully through a minefield of loaded questions from the audience. [ PJC ]