People are being asked not to share footage of a fatal assault on social media.
A man in his 40s died after being stabbed earlier this week.
A vigil was held last night in Ongar to remember Aaron Keating.
He was stabbed to death following a row on Main Street on Tuesday evening.
Footage of the incident has been shared on social media and gardai are asking people not to do this.
They're asking anyone who may have recorded footage of what happened to share it with them,
Detectives are also continuing to appeal to any witnesses to come forward.
A teenage boy was arrested the morning after the assault and is still being questioned this afternoon.
A garda spokesperson says: "Gardaí in Blanchardstown are continuing to investigate the fatal assault that occurred on Main Street, Ongar on Tuesday 13th June, 2023.
"A male juvenile teen was arrested on suspicion of murder and conveyed to a Garda Station in West Dublin where he is currently detained under Section 4 of the Criminal Justice Act, 1984.
"A post mortem of the deceased, a male in his 40s, has been conducted. The results of which will not be released for operational reasons.
"Gardaí are continuing to appeal for any persons with information in relation to this incident to come forward and any road users with video footage (including dash cam) are asked to make this available to them.
"Gardaí are aware that members of the public may have recorded footage of this incident and request that this footage is provided to Gardaí and not to share it on social media.
"Investigating Gardaí are continuing to appeal to any persons who were in the vicinity of Main Street, Ongar the evening of Tuesday 13th June, 2023 between 6.30p.m. and 7p.m. to contact them at Blanchardstown Garda station on 01 666 7000, the Garda Confidential Line on 1800 666 111, or any Garda station."