Remote Lieutenant Island location makes battling blaze at two-story structure difficult.

SOUTH WELLFLEET — A structure fire on Lieutenant Island in which two people died early Monday leveled the two-story house at 65 4th St., leaving heaps of charred rubble and debris in its wake.

It also left few answers.

As of Monday night, officials had not released the names of the two who died nor information on what might have caused the blaze.

In front of the residence, where the heaping ruins lay, a wooden address sign in the shape of a fish bore the name “Kral.” According to the Wellfleet assessor's database, the property was most recently transferred to a Cathleen Kral, and Cathleen and Ferdinand Kral are listed as the owners. The single-family home was assessed at $892,400.

The two are also listed as the owners of a property, assessed at $527,500, located at 85 4th St., records show.

The area surrounding the residence was cordoned off Monday with yellow tape, which was secured in a knot on the fish-shaped plaque.

On the other side of the tape, near what appeared to be home’s entrance, were piles of debris: metal folding chairs, yard implements, cinder blocks, a decoratively molded coffee table. To the right of the cement foundation there appeared to be a gardening area; to the left, a windowless car, badly scorched from the fire.

The fire sent ash raining down on nearby homes.

“There were ashes all over our steps this morning,” said Marion Volterra, of Attleboro, who lives part of the year at 8 5th St.

The house was at the far end of the island, which is sparsely populated in the winter. The mainland is connected by a small wooden bridge in Loagy Bay. A single-lane muddy street winds through the island.

“With a fire of this significance, it’s obviously going to take a while” to determine a cause, said Jennifer Mieth, a public information officer with the state fire marshal’s office.

The Wellfleet Fire Department initially responded to a report of smoke in the area of 955 State Highway before dispatchers were alerted to a brush fire on Lieutenant Island, according to a statement issued by the department. Mutual aid was requested from the Eastham and Truro fire departments.

See video of the Wellfleet fire scene:

Heavy fog and the remoteness of the area made it difficult to obtain an exact location for the fire, the statement says.

The residence had partially collapsed by the time firefighters arrived, prompting a second alarm for staffing and water supply, according to the statement.

Several pre-connected hand lines were deployed to protect surrounding homes, and a rural water supply was established by using a combination of water tanks and a hydrant at the corner of Route 6 and Marconi Beach Road.

It took firefighters more than an hour to gain control of the blaze, the statement says. The Orleans, Provincetown, Brewster and Harwich fire departments, as well as the Cape Cod National Seashore, also provided assistance.

A Wellfleet firefighter was injured, but declined medical treatment at the scene. After the fire was extinguished officials discovered the two bodies in the house, the statement says.

On Monday afternoon, a police officer at the scene referred questions to the district attorney’s office.

“State police detectives, Wellfleet police and the state fire marshal’s office are investigating a house fire in Wellfleet involving the death of two occupants,” Cape and Islands District Attorney’s Office spokeswoman Tara Miltimore said via email. "Foul play is not suspected at this time.”

— Follow Tanner Stening on Twitter: @tsteningCCT.