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.