According to District of Columbia Police Chief Cathy Lanier, fire in Northwest Washington home where four people were found dead was intentional.

Two of the fire victims have been identified as Savvas Savopoulos, 46, and his wife, Amy Savopoulos, 47.

Lanier said the other two victims had been identified as the 10-year-old son, Philip, and a housekeeper, Veralicia Figueroa, 57, of Silver Spring, Md.

Officials said autopsy findings revealed that three of the four victims had blunt-force injuries or stab wounds. The injuries were sustained before the fire was set on Thursday afternoon, said Lanier.

He further said investigation into the case is in its early stages and evidence collection will keep continuing for several days. However, he said that there were no signs of forced entry at the home.

Police is also looking for any information about a blue 2008 Porsche belonging to the family that was found Thursday night in Prince George's County, Md. The car had also been set on fire.

As per officials, Savvas Savopolous was the president of American Iron Works, a building materials manufacturer based in Hyattsville, Md.

The family home, valued at $4.5 million, is located few blocks away from Vice President Joe Biden's official residence and from the Washington National Cathedral, which was preparing to host memorial services for the victims.

Lisa Lambert, who lives nearby but did not know the family well said that the incident has left residents frightened, everyone in the neighborhood is incredibly unsettled about the case.

The couple had two older daughters who, according to neighbors, attend boarding schools out of state. The daughters are safe and police know their whereabouts, a police spokeswoman said.