The search began Tuesday and continues Wednesday, the sources said.
[Ads /]
Two NYPD ESU K-9s helped assist Suffolk police as they combed through the large wooded area off the Long Island Expressway near exit 70.
The Suffolk district attorney's office declined to comment on the specific nature of the search but issued the below statement:
"The Suffolk County Police Department, the New York Police Department and the New York State Police are working with the District Attorney's Office on an ongoing investigation. We do not comment on investigative steps while they are underway. We will make further statements when appropriate."
[Ads /]
Rex Heuermann has been charged in connection with the deaths of four women whose bodies were found near Gilgo Beach. He has pleaded not guilty.
Watch our series 'Eyewitness to Gilgo Beach' wherever you stream ABC 7 New York
Authorities have said their investigation continues to see if they can link Heuermann to six other victims.
The remains of Jessica Taylor, a 20-year-old sex worker, were found several miles east of the "Gilgo Four" in March 2011. Other remains from Taylor were previously discovered in Manorville, in eastern Long Island, in July 2003.
The remains of Valerie Mack, a 24-year-old escort, were found in April 2011 about a mile and a half east of Taylor's remains and a little over two miles east of the "Gilgo Four." Mack's partial remains were previously discovered in Manorville in September 2000, and police have suggested there may be a connection to Taylor's remains.
No one has ever been charged in their deaths.
(ABC News contributed to this report.)
ALSO READ | Former secretary of accused Gilgo Beach serial killer Rex Heuermann speaks out
Rex Heuermann's former assistant speaks out about the charges against him
----------
* More Long Island news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube