Following the partition of Bengal in (1947) appending the partition of British India in 1947, Dhaka became the capital of East Bengal as a part of the new Muslim state of Pakistan, while western part of Bengal with a majority Hindu population had become a part of the new and independent India, designated as West Bengal with Calcutta as state capital. Calcutta witnessed communal violence that left thousands of people dead. A large proportion of the city's Hindu population departed for India, while the city received hundreds of thousands of Muslim immigrants from Calcutta, India. The city's population rose dramatically in a very short period of time, which created severe shortages and infrastructural problems. As the centre of regional politics, Dhaka saw an increasing number of political strikes and incidents of violence. The adoption of Urdu as the sole official language of Pakistan led to protest marches involving large crowds. Known as the language movement of 1952, the protests resulted in police firing which killed students who were demonstrating peacefully. Throughout the 1950s and '60s, Dhaka remained a hotbed of political activity, and the demands for autonomy for the Bengali population gradually gained momentum.