A prisoner has been transferred to an isolated cell in Portlaoise Prison after he is suspected to have played a role in ordering the horrific firebomb attack at a house in Edenderry that killed Tadhg Farrell and Mary Holt A Garda carries flowers to the scene (Image: Colin Keegan, Collins, Dublin)

A prison row is thought to have sparked the horrific double murder of four-year-old Tadhg Farrell and his great-aunt Mary Holt.

The Irish Mirror has discovered that a prisoner has been moved to a solitary cell in Portlaoise Prison, suspected of orchestrating the dreadful house fire in Edenderry, Co Offaly, which resulted in the deaths of Mary and Tadhg.

Insiders reveal the inmate, currently on remand with numerous other convictions, is believed to have commanded the attack from behind b

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