Oct 07, 2017, 0:11
Several others were injured as flames swept through the "Innocent People" nursery in the small city of Janauba, about 375 miles (600 km) east of the capital, Brasilia.
The security guard allegedly responsible for the attack is believed to have died in hospital after the attack this morning.
The incident occurred in a modest quarter of Janauba, a city of 70,000 about 600km north of Belo Horizonte city.
Following this, the security guard died after succumbing to his own burn injuries.
A security guard doused alcohol on some toddlers in a day care centre and cruelly set them alight in an attack in Brazil, horrifying the nation.
The incident left the perpetrator "with burns all over his body", Bruno Ataide Santos, director of the local hospital stated.
Janauba Mayor Carlos Isaildon Mendes has declared a seven-day mourning period.
A security guard at a day care center in Brazil started a fire killing four children and injuring nearly 30 others. Police are still looking into the causes of the attack.
Local officials have not released the victims' identities but said the children were between the ages of 1 and 4.
"I woke up early to drop him at the nursery", Jane Kelly da Silva Soares told the local O Globo newspaper. Evacuation would have been more hard.
"I am very sorry for tragedy that led to death of 4 children in Janabua", said Brazilian president Michel Temer, social media. "I want to express my sympathy to the families".
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Patchy morning fog to clear by afternoon