16-YEAR-OLD boy was trying to flee the scene of the fatal stabbing of his father and mother when police arrived at the family's Sydney home yesterday, NSW police say.
Officers were called to a house in Baulkham Hills, in Sydney's northwest, shortly after 7am yesterday after a triple-0 call was made by a 50-year-old woman, believed to be the teenager's mother or stepmother, who alerted ambulance officers that a 57-year-old man had been stabbed, police said.
After making the call, the woman was also attacked, suffering stab wounds to her stomach and back.
When police arrived, the man, confirmed as the boy's father, was found dead. The woman was taken to Westmead Hospital but died later of her injuries.
Police say that when they arrived at the house, the boy was trying to leave on foot, carrying his school bag.
"He was verbally aggressive towards police," said Superintendent Sue Waites. "There was an altercation with police in the front yard. Police had to stop him from leaving. He was handcuffed and detained."
Superintendent Waites said police had also found the knife used in the attack.
"There was 'a fair amount of blood' in the two rooms of the house where the attack took place," Superintendent Waites said.
Police confirmed the teenager was the man's son and said they believed the woman to be his mother, however they were unsure of this fact because it was the man's second marriage.
The man had a second child, an elder daughter, possibly from his previous marriage, who was not at the house at the time.
Police said they had never been called out to the house before.
They said they would spend the remainder of the day interviewing the teenager, canvassing neighbours and "going through everything with a fine-tooth comb".