NBC (nuclear, biological and chemical) fire fighters practice a rescue operation in the central Italian city of Rieti. NBC (nuclear, biological and chemical) fire fighters in full protective clothing practice a rescue operation in a mock metro station set up in the central Italian city of Rieti, 80km (50 miles) north of Rome September 22, 2005. Italy fears it might be targeted in the coming months by Islamic extremists following attacks over the past two years in London and Madrid. Authorities in the northern Italian city of Milan are due to hold a simulated terror emergency scenario on Friday.