The bodies of a couple and their two children were found Tuesday afternoon as a deliberately set fire swept through their sprawling estate in the upscale community of Colts Neck, New Jersey, CBS New York reports.
The fire was first reported around 12:45 p.m.
The Monmouth County Prosecutor's Office confirmed on Twitter that there were "multiple fatalities" but did not provide any details or the identities of the victims.
According to Monmouth County property records, 15 Willow Brook is owned by Keith and Jennifer Camiero.
More than 20 fire departments tackled the blaze at the mansion, worth $1.5 million (£1.2 million).
A man was found dead outside the burning mansion in Colts Neck, and the three others were found inside, Monmouth County prosecutor Christopher Gramiccioni said at a news conference. But he insisted, "We have no reason to believe that anyone in the community is in any danger at this time".
"Unfortunately they were burned so severely as a result of the fire they were exposed to", he said.
Mansion Catches on Fire in New Jersey, Several Dead
Firefighters battle a blaze in a house in Colts Neck, N.J., November 20, 2018.Firefighters battle a blaze in a house in Colts Neck, N.J., November 20, 2018.
Investigators at the Ocean Township fire found several gas cans near the back of the house, NBC reported.
Colts Neck is a wealthy community 50 miles south of NY, home to celebs including rock star Bruce Springsteen and U.S. comedian Jon Stewart. It's home to horse farms and some homes in the town of 10,000 are valued at around $750,000 each, AP noted.
The home is 5,700 square feet. His profile says he graduated from Columbia University with a Master of Science degree in 2018 and previously received certifications from Harvard Business School.
Caneiro is the founder and boss of SquareOne, while his brother, Paul is the vice president.
Gramiccioni said that it was too early to tell if a fire at a home on Tilton Drive in Ocean Township early Tuesday morning was connected to the fire in Colts Neck.
The brothers were also partners in a pest control company they operated from the same office.