German East Africa was captured by the British during World War I and became the territory of Tanganyika, while Dar es Salaam remained the administrative and commercial centre. Under British indirect rule, European areas such as Oyster Bay and African areas (e.g., Kariakoo and Ilala) developed separately from the city centre. The city's population also included a large number of workers from British India, many of whom came to take advantage of trade and commercial opportunities. After World War II, Dar es Salaam experienced a period of rapid growth.