List of capitals in Pakistan
Islamabad officially became the capital of Pakistan on 14 August 1967, exactly 20 years after the country's independence. Previously, Rawalpindi was the capital, designated in 1958. The first capital of Pakistan was the coastal city of Karachi, which was selected by Muhammad Ali Jinnah. Karachi was and still is the largest city and economic capital of Pakistan. It remained the seat of government until 1959, when the military president, Ayub Khan, decided to build a new capital in the north of Pakistan, near the general headquarters of the Pakistani Armed Forces at Rawalpindi.
Targeted killings in Pakistan
Karachi is a cosmopolitan city and consists of many ethnic communities; the city's demographics play an important role in its politics. Ethnic politics have resulted in sporadic violence throughout Karachi's history, often leading to bloody conflicts. Following the independence of Pakistan in 1947, Muslim immigrants from areas constituting modern-day India migrated in large numbers to the Muslim nation of Pakistan and became settled in Karachi, the historical capital of the Sindh province. The early migrants who came and settled are known as Muhajirs, something which was resented by a portion of the province's native Sindhi people and radical Sindhi nationalists. After the breakaway of East Pakistan in 1971 and the formation of Bangladesh, Pakistan accepted a large number of Biharis (known as "Stranded Pakistanis") loyal to the country, trapped in Bangladesh and offered them citizenship. The Bihari migrants assimilated into the diverse Urdu-speaking Muhajir population. Some Bengalis in Pakistan also stayed behind. 
The Pashtuns (Pakhtuns or Pathans), originally from Khyber Pakhtunkhwa, FATA and northern Balochistan, are now the city's second largest ethnic group in Karachi after Muhajirs. With as high as 7 million by some estimates, the city of Karachi in Pakistan has the largest concentration of urban Pakhtun population in the world, including 50,000 registered Afghan refugees in the city. As per current demographic ratio Pashtuns are about 25% of Karachi's population.