Here's a look at what you need to know about Pakistan, the sixth most populous country in the world. It borders Iran, Afghanistan and India in Southeast Asia. In 1947, Pakistan gained its independence from Great Britain.
About Pakistan: (from the CIA World Factbook) Land Area: 796,095 sq km (slightly less than twice the size of California)
Population: 193,238,868 (2013 est.)
Median age: 22.2 years old
Ethnic Groups: Punjabi 44.68%, Pashtun (Pathan) 15.42%, Sindhi 14.1%, Sariaki 8.38%, Muhajirs 7.57%, Balochi 3.57%, other 6.28%
Religion: Muslim 96.4%, other (includes Christian and Hindu) 3.6%
GDP: $523.9 billion (2012 est.)
GDP per capita: $2,900 (2012 est.)
Unemployment: 6.2% (2012 est.)
Timeline: August 16, 1947 - Great Britain gives independence to the Indian subcontinent, splitting it into India, West Pakistan, and East Pakistan (now Bangladesh).
1947-1948 - Pakistan fights its first war against India over control of the Kashmir area.
1965 - Pakistan and India fight their second war over Kashmir.
1971 - Pakistan and India go to war over independence for East Pakistan, later renamed Bangladesh.
1973 - A constitution providing for a parliamentary system of government is adopted.
July 5, 1977 - Prime Minister Zulfikar Ali Bhutto is deposed in a bloodless coup led by the army. He is executed in April 1979.
1985 - Martial law ends, and the parliamentary government is reestablished.
December 1, 1988 - Benazir Bhutto is elected as the first female prime minister of Pakistan and of any Muslim nation.
1991 - Legislation is passed making Islamic law the law of the land.
April 6, 1998 - Pakistan successfully tests a medium-range missile capable of carrying a nuclear warhead On May 28, Pakistan announces it successfully conducted five nuclear tests after detonating a boosted uranium device and four low yield sub-kiloton devices.
May-July 1999 - Pakistan and India engage in a brief war over Kashmir.
October 12, 1999 - General Pervez Musharraf takes power in a bloodless coup. He declares himself president in June 2001.
August 31, 2007 - Musharraf amends the Pakistan constitution to allow himself a third term as president.
September 10, 2007 - Former Prime Minister Nawaz Sharif returns to Pakistan and is deported within hours of landing at the Islamabad airport. He returns to Jeddah, Saudi Arabia.
October 5, 2007 - Musharraf signs a "reconciliation ordinance" that drops outstanding corruption charges against former Prime Minister Benazir Bhutto, opening the way for Bhutto's return to Pakistan and a possible power-sharing agreement between them.