The Police Service of Northern Ireland (PSNI) mounted a huge security operation in County Fermanagh, at Belfast International Airport (where many of the G8 leaders arrived) and in Belfast. The police operation involved about 8,000 officers: 4,500 from the PSNI and 3,500 who were drafted in from other parts of the UK. They were also trained in PSNI riot tactics and to drive its armoured vehicles.[14] The Lough Erne Resort was surrounded by a four-mile long metal fence and razor wire.[15] Lower Lough Erne was made off-limits to the general public[16] and an air corridor between Belfast and the Resort was made a no-fly zone during the summit.