'This incident will have a significant impact on the family, friends and loved ones of all those involved ... our thoughts are with them all, particularly the 12-year-old girl.'

WA Police Major Crime Acting Inspector Jessica Securo said.

A teenage boy accused of stabbing his mother to death in Bentley, Western Australia, has a history of violent offending that left his family desperate for support.

The 16-year-old boy was arrested at the house on Tuesday morning after police were called to the scene following reports of a violent attack.

His mother, a 35-year-old woman, was found dead, having allegedly been killed by her son.

A 12-year-old girl who was also stabbed inside the family's home on Albany Highway managed to run to a nearby road where bystanders provided her with life-saving first aid.

Sources close to the family told the masthead that the boy had recently been released from Banksia Hill Detention Centre and had a history of severe assaults, grievous bodily harm, and breaking and entering.

The family was known to the child protection system.

WA Police Major Crime Acting Inspector Jessica Securo said the boy was known to police and detectives were examining any previous interactions the family or boy had with authorities.

Securo said the investigation into the incident is still in its early stages but police are investigating this as a suspected family violence homicide.

The 12-year-old girl was rushed to Princess Margaret Hospital and is in a serious but stable condition.

A team of detectives and forensic experts were at the scene on Tuesday afternoon collecting evidence.

The house on Albany Highway has been cordoned off by police and is expected to remain that way for several days as the investigation continues.

The 16-year-old boy is yet to be charged and is currently in custody.

Police have asked anyone with information about the incident to come forward.

The incident has sent shockwaves throughout the community, with many people taking to social media to express their horror and sadness.

The family's loved ones have been left reeling from the tragedy, and the community is coming together to support them.

Key Facts

• The 35-year-old mother was found dead at her home on Albany Highway. • The 16-year-old boy was arrested at the scene and is currently in custody. • The 12-year-old girl is in a serious but stable condition at Princess Margaret Hospital. • The family was known to the child protection system. • The boy had a history of severe assaults, grievous bodily harm, and breaking and entering.