The father of tragic Tadhg Farrell has been arrested over a prison row which happened hours before the fatal arson attack in Edenderry.
Aaron Holt is being questioned by gardai over a jail attack on a suspect whose associates are linked to horror firebombing.
Niall speaks to Crime World's Ken Foy about the investigation into the deaths of Tadhg and his grandaunt Mary Holt.
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Crime World