NEW YORK (CBSNewYork/AP) — State police on Monday closed a five-mile stretch of parkway on New York’s Long Island to look for human remains and other clues in the case of a possible serial killer.

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About 50 officers were searching in dense underbrush along the Wantagh State Parkway between Merrick Road in Wantagh and Ocean Parkway on the Atlantic, Capt. James Dewar said.

Ten sets of human remains have been found since December along Ocean Parkway near Jones Beach. The case began as a search for missing New Jersey prostitute Shannan Gilbert last seen in the area of Oak Beach a year ago. She has not been found, but four other bodies have been identified.

Nothing of interest had been found by early Monday afternoon, Dewar said.

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He said there was no specific information, evidence or tip that prompted the wider search. The Wantagh Parkway was targeted because it leads to Ocean Parkway and is “similar in terrain and in isolation,” he said.

That means dense underbrush, few homes and difficult going, Dewar said. He said six cadaver dogs and at least two helicopters had joined the search.

The highway and its bikes-and-pedestrians path were closed at 9 a.m. and would probably be reopened Monday evening, Dewar said. He said the search might continue Tuesday.

In addition to state troopers, police officers from Nassau County and the state Department of Environmental Conservation were taking part, Dewar said.

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