A 23-year-old man has been arrested by gardaí investigating a fatal crash on the M7 last week in which a 43-year-old woman was killed.

Investigators from both the Garda Ombudsman and An Garda Síochána are waiting to interview a group of five youths — including three teenagers, one as young as 13 — in relation to a horrific car crash which left an innocent woman dead.

The Garda Ombudsman Commission is Iinvestigating after a high-speed car chase on the M7 last night claimed the life of a woman.