It is understood the incident began after gardaà followed two separate males into the Bellingsmore housing complex.
The Nkencho family recently moved to the area after leaving their home in Clonee following George Nkenchoâs death.
Protest
At a protest outside the offices of the Garda Ombudsman Commission (Gsoc) on Thursday, demonstrators expressed anger over the incident, which they alleged involved excessive Garda force.
âThere would have been no breach of the peace had the gardaà not been there,â said Fingal Cllr John Burtchaell of the Socialist Party.
He alleged the youth was assaulted in the Garda car on the way to the station. In response, a Garda spokesman said âanyone with a complaint in relation to an interaction with a garda or gardaà can make a complaint to Gsocâ.
George Nkencho shooting: Inquiry will look at graduated use of force Retired garda urges people not to judge incident based on phone footage lacking context
Sat, Jan 2, 2021, 01:17
Conor Gallagher Crime Correspondent Listen now 5:48
People at a candlelit vigil in Dublin for George Nkencho. Photograph: Niall Carson/PA Wire
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Much of the final hour of George Nkencho’s life was filmed, with the videos shared around social media and WhatsApp groups despite pleas from his family.
There is a video of Mr Nkencho walking back from assaulting a member of staff in a supermarket in Hartstown, a line of Garda vehicles following slowly behind.