Terrorism in Pakistan has become a major and highly destructive phenomenon in recent years. The death toll from terrorist attacks has risen from 164 in 2003 to 3318 in 2009, with a total of 35,000 Pakistanis killed as of 2010. According to the government of Pakistan, the direct and indirect economic costs of terrorism from 2000-2010 total $68 billion. [1] President Asif Ali Zardari, along with former President ex-Pakistan Army head Pervez Musharraf, have admitted that terrorist outfits were "deliberately created and nurtured" by past governments "as a policy to achieve some short-term tactical objectives".The trend began with Muhammad Zia-ul-Haq's controversial "Islamization" policies of the 1980s, under which conflicts were started against non-muslim countries. Zia's tenure as president saw Pakistan's involvement in the Soviet-Afghan War, which led to a greater influx of ideologically driven Afghan Arabs to the tribal areas and increased availability of guns such as the AK-47 and drugs from the Golden Crescent.
http://en.wikipedia.org/wiki/Terrorism_in_Pakistan