Historically, little is known about early African immigration to China, although there is no doubt and much consensus that the human species was originally from Africa. Due to recent developments in relations, many have been relocating for better opportunities. Places dubbed 'Little Africa' and 'Chocolate city' are increasingly receiving new immigrants, mostly Nigerians. Most of the African immigrants are concentrated in the area of Guangzhou with an estimated number of 20,000. It is estimated that there are around 10,000 illegal African immigrants in China and police crackdowns have intensified since early 2009.