Those arrested have been identified as Babu (32), Om Prakash (24), Rahul (24), Ajay (25) and Kunal (20).
Three more persons have been identified and the police are looking out for them, DCP (south) Ishwar Singh said.
Kunal was earlier suspected to be a minor and his actual age was verified after scanning several documents, a senior official said.
Meanwhile, a fresh case in the matter was registered today in connection with the alleged physical assault of a brother-sister duo from Cameroon around the same time in the area.
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The arrests were made in connection will all four cases taken together.
While some of the accused persons are residents of Maidan Garhi, the others are from Rajpur Khurd, police said.
Police intensified the probe today after External Affairs Minister Sushma Swaraj took up the issue with Home Minister Rajnath Singh and Lieutenant Governor Najeeb Jung.
African nationals in the area have planned a demonstration at Jantar Mantar on Tuesday to protest against the attacks and the killing of a 23-year-old Congolese man in south Delhi's Vasant Kunj area last week.
Police have claimed the attacks were not planned and coordinated and not racial in nature.
While the victims alleged that they were racially abused and attacked with bats and rods by small mobs, police denied the allegations attributing two of the incidents to disputes over African nationals playing loud music and the other to a scuffle over public drinking.
During investigation it emerged that the first incident took place when a man was heading to a hospital with his ailing mother in his car and got stuck in a congested lane.
When the former asked the African person to lower the volume and let his car pass, he refused citing a congested road ahead of him.
Following this, an argument broke out between the African man and some locals.
Meanwhile, another African man, who sustained severe injury on his nose, was passing by in an autorickshaw and he intervened.
The argument soon led to a scuffle and they were beaten up.
However, the police are still trying to join the dots to ascertain how the other incidents took place around the same time in such close proximity.