A 12-year-old boy from Alberta has been charged with attempted murder after allegedly stabbing his younger brother.

Lethbridge police were called to a home in the north end of the city around 4:30 p.m. on Aug. 27 after getting reports that a child had been stabbed.

According to police, a father called 911 after coming home and finding his seven-year-old son with injuries. The injured boy’s 12-year-old brother told his dad that a stranger had come into the house and stabbed the young boy before running away.

The victim was rushed to a local hospital in critical condition. He was later airlifted to the Edmonton Children’s Hospital and remains there in stable condition.

Investigators searched the home and found a knife they believe was used in the attack. Further evidence led police to believe the 12-year-old boy stabbed his younger brother several times and thought that he had killed him.

The older brother then made up a story about an intruder coming into the home when his father arrived.

The 12-year-old boy has been charged with attempted murder and aggravated assault. He remains in custody.

The boy cannot be identified under the Youth Criminal Justice Act.