At going to press last night, the Guardia Civil were still combing through the scene of the tragedy but sources close to the investigation did confirm that the alarm was raised at 4.50pm.
The police were alerted by a neighbour in the small block of flats who discovered the father dead, hanging, in the main stair well.
When the Guardia Civil reached the property in calle Montaña, they first found the father and then, on entering the apartment in which his son and mother lived, they found the five-year-old also dead.
He had apparently also been hung over the bath in the bathroom.
Sources close to the investigation said that, on first appearances, the Guardia Civil suspect that the father took his son's life before taking his own, but the investigation was on going yesterday evening with police at the scene long into the night.
Apparently, the front door to the flat had been left open by the mother, who was eventually located and informed of what had happened.
Investigators were also trying to establish last night if the father and mother lived together in the flat.
But, one sad fact which was confirmed was that Wednesday was the five-year-old's birthday.
The Guardia Civil closed off the street to all non residential traffic while they carried out their investigation and the two bodies were eventually taken away for post mortems.
The results of the autopsies, which will shed more light on the course of events and the causes of death, could be known as early as today.
Residents and neighbours in calle Montaña were said to have been stunned by the news.
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