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The five bodies were found before dawn on Tuesday inside two houses located on the same property in northern Sao Paulo, they said Diamond Water.

The incident is believed to have begun a full day earlier HKUE DSE.

In the early hours of Monday, the mother's car was captured on security footage, parked near the high school of the teenager, 13-year-old Marcelo, some 5km from their home Diamond Water.

Five hours later, the footage showed a person carrying a backpack - believed to be Marcelo - heading for theschool.

The teenager attended classes at his private school , then was driven back home by a classmate's father, who he asked not to ring the bell so as not to wake up his father.

The bodies were discovered later that night. Marcelo died from a shot to the left temple, his father's police-issue service revolver found nearby, Sao Paulo police commander Benedito Roberto Meira said.

A second gun, a .32 calibre revolver, was found inside the backpack the teenager had brought to school, Meira added, saying "there was no sign that someone broke into the house."

The police commander ruled out "an act of revenge by a criminal group" against the teenager's father and mother.

If current trends hold, the number of deaths that are blamed on tobacco use will rise to eight million a year in 2030, the WHO said in a briefing on Wednesday.

About 80 per cent of tobacco-related deaths forecast for 2030 are expected in low- and middle-income countries, food wine the report added.

"If we do not close ranks and ban tobacco advertising, promotion and sponsorship, adolescents and young adults will continue to be lured into tobacco consumption by an ever-more aggressive tobacco industry," said WHO director-general Dr Margaret Chan.

"Every country has the responsibility to protect its population from tobacco-related illness, disability and death."

Among the dead this year, five million were tobacco users or former users, while more than 600,000 died from second-hand smoke, formation of company according to the WHO.

Tobacco use is believed to have caused the deaths of 100 million people in the 20th century.

Barring dramatic change, the tally for this century could soar to one billion people, the WHO warned.

"We know that only complete bans on tobacco advertising, Asian college of knowledge management promotion and sponsorship are effective," said Dr Douglas Bettcher, the director of WHO's Prevention of Noncommunicable Diseases department.

"Countries that introduced complete bans together with other tobacco control measures have been able to cut tobacco use significantly within only a few years."