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Unarmed gardaà arrived at the scene and were threatened by Nkencho, according to a Garda statement. A slow-motion foot chase ensued, with gardaà following behind Nkencho and telling passersby to clear the way as he walked through the Hartstown housing estates.
By the time Nkencho reached his home some 15 minutes later, two members of the Garda Armed Support Unit (ASU) had arrived.
The 27-year-old knocked on his front door, which was answered by his sister Gloria. In a written statement, Gloria says she told the gardaà that Nkencho had mental health issues and to leave him alone.
Gardaà say they believed Nkencho might be about to enter the house and take hostages. One officer ushered Gloria back inside the house and the door was closed over. Nkencho was then pepper sprayed before ASU members fired a Taser at him twice in a bid to make him drop the knife.