Washington (CNN) Local police are investigating a deadly fire in one of Washington's poshest neighborhoods on Thursday that killed four people near the vice president's residence and Embassy Row.

The three-story, $4.5 million-dollar house was allegedly set ablaze , killing a couple -- Savvas Savopoulos, 46, and his wife Amy Savopoulos, 47; their son, Philip, 10; and one of the family's housekeepers, Veralicia Figueroa, 47, according to police

Three of the four victims were found to have suffered from blunt force trauma, causing authorities to rule the fire arson and police are investigating what they call a quadruple homicide.

The victims were found inside a Woodland Drive home after fire crews arrived to put out a house fire there about 1:30 p.m. Thursday.

Also raising suspicions is a text message sent to a second housekeeper, Nelitza Gutierrez, that arrived three hours before the fire began.

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