Suffolk County’s Arson Squad is investigating a Ronkonkoma fire that ravaged three vehicles and a Richmond Boulevard home early Thursday.

Police said a vehicle parked in front of the house caught fire at about 5:20 a.m., then the blaze extended to two vehicles parked in the driveway and to the house.

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All three vehicles were destroyed and there was extensive damage to the house, police said.

Neighbors saw the fire and one of them knocked on the door of the home, a police spokeswoman said. Two occupants, a man and a woman, were then able to escape.

No injuries were reported, and police said later Thursday they did not immediately have a cause for the fire.

The Ronkonkoma and Lakeland fire departments responded, police said.

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Police Thursday afternoon said two containers with an unknown accelerant found on the scene were being tested, News 12 Long Island reported.