Gardaí confirmed they have arrested a man and two women.

Philip and Kim English and two of their children, Callum and Jayden, perished in the fire during the early hours of Tuesday morning (October 13). Two other children, believed to be in the same family, remain in critical condition following the fire.

Two people have been arrested in relation to Tuesday morning's arson attack at a domestic residence in Waterford City, which killed four members of the English family, including two children.

Gardaí have made "significant" progress after the fatal arson attack in Co Waterford, which Ireland's Justice Minister says was 'fuelled by drugs.'