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The man in his late 20s was arrested in the Dublin area yesterday
A man remains in custody this morning as part of an investigation into the murder of a teenager in County Louth.
The 17 year-old boy was killed in Drogheda in January last year.
The man in his late 20s was arrested in the Dublin area yesterday morning and is being held at a Louth Garda Station.
He can be questioned for up to 7 days.