Article: In the 1980s, 1990s, and 2000s, terrorist attacks in Egypt became numerous and severe, and began to target Christian Copts, foreign tourists and government officials. In the 1990s an Islamist group, Al-Gama'a al-Islamiyya, engaged in an extended campaign of violence, from the murders and attempted murders of prominent writers and intellectuals, to the repeated targeting of tourists and foreigners. Serious damage was done to the largest sector of Egypt's economy—tourism—and in turn to the government, but it also devastated the livelihoods of many of the people on whom the group depended for support.

Now answer this question: What sector of economy was plagued by terrorism attacks?
tourism