Gardai are continuing to question a man in connection with the murder of Conor O'Brien in Co. Meath.
The man, who is in his 50s, is being held for questioning at Carlow Garda Station.
He was detained in the town on Tuesday on suspicion of firearms offences, but was re-arrested yesterday in relation to the murder of Conor O'Brien.
The 19 year old was shot dead in Enfield one week ago today.
He was not known to the gardai, who have described him as a 'quiet young man'.
