Following the Iraqi invasion of Kuwait in 1990 Saudi Arabia joined the anti-Iraq Coalition and King Fahd, fearing an attack from Iraq, invited American and Coalition soldiers to be stationed in Saudi Arabia. Saudi troops and aircraft took part in the subsequent military operations. However, allowing Coalition forces to be based in the country proved to be one of the issues that has led to an increase in Islamic terrorism in Saudi Arabia, as well as Islamic terrorist attacks in Western countries by Saudi nationals – the September 11 attacks in New York, Washington, and Pennsylvania being the most prominent example.