Sao Paulo News: A 16-year-old Brazilian boy, upset over having his cell phone taken away, shot and killed his parents and sister!

Sao Paulo News: A 16-year-old Brazilian boy, upset over having his cell phone taken away, shot and killed his parents and sister. The local security ministry said in a statement that the triple murder in Sao Paulo happened on Friday, but it came to light on Monday when the boy called the police and confessed to his crime.

According to news agency AFP, investigation chief Roberto Afonso said the teen (who was adopted) became 'very depressed' when his parents took away his phone after an argument.

Murdered with father's service gun

The boy told investigators that he shot his father (a municipal policeman) in the back with his service gun. He then went upstairs and shot his 16-year-old sister in the face. When his mother arrived home several hours later, he killed her with the same weapon, police said. Investigators said the father was 57 years old and the mother was 50 years old.

"We need to understand if this was frustration linked to some kind of psychological disorder," Afonso told Brazilian network TV Record. He said police were also investigating whether anyone else was involved. It would also be investigated whether the boy had spoken to anyone on the phone.

The teenager stayed in the house with the three bodies from Friday to early Monday. During this time, he went to the gym and shopped at a bakery. According to Afonso, the youth was angry on Saturday as well and stabbed his mother's body

with a knife. He said the boy, who is lodged in the juvenile detention center, had a 'cool' demeanor while discussing the crime.

Minor defendants are protected by special laws in Brazil and cannot be tried as adults.