A murder investigation has been launched following the discovery of a significant amount of petrol at the scene of the Omagh house fire.
All seven bodies have been found in the remains of the house at Lammy Crescent.
The terraced house remains cordoned off, with tonnes of blackened rubble affected by persistent rain. Police are conducting searches of the general area.
Arthur McElhill and his partner Lorraine McGovern lived with their five children at the end of a terrace.
The five children ranged in age from 13 to less than a year.
Mr McElhill was from the small town of Ederney and was a farmer.
Northern Ireland Deputy First Minister Martin McGuinness visited the scene today and spoke to firefighters, some of whom have not slept since yesterday morning's tragedy.
He said he was alarmed by the suggestion that a crime had been committed, saying it made 'a bad situation very much worse'.
Many of the estates in the area were built by the Housing Executive, however a spokesman said that the fire-damaged property was in private ownership and could have been sold under a tenant purchase scheme.
According to him, the couple may have been renting the accommodation as they were in receipt of housing benefit.
PSNI officers used torches to search the area around the badly-burned building last night.
