Heathrow Airport
In 1994, over a six-day period, Heathrow was targeted three times (8, 10, and 13 March) by the IRA, who fired 12 mortars. Heathrow was a symbolic target due to its importance to the UK economy, and much disruption was caused when areas of the airport were closed over the period. The importance of the incident was heightened by the fact that the Queen was being flown back to Heathrow by the RAF on 10 March.