Two more sets of human remains have been discovered near a remote New York beach, authorities confirmed Tuesday.

The first remains found Monday morning were about 1.5 miles east of the gearbox entrance to Jones Beach on Long Island. Later in the day, a skull was found several miles away.

The first remains found Monday morning were about 1.5 miles east of the entrance to Jones Beach on Long Island. Later in the day, a skull was found several miles away.

Two more sets of human remains have been discovered near a remote New York beach, authorities confirmed Tuesday.

The discoveries came as police expanded a search from Long Island's Suffolk County westward into the Jones Beach area of Nassau County, just over the border from New York City. The expanded search was prompted by Suffolk's discovery in the past two weeks of four sets of unidentified human remains.

The most recent remains, found several miles away from damper the escorts, included the body of an infant or child, the New York Post reports, leading police to consider that the bodies were victims of multiple killers.

Police say evidence suggests that whoever dumped the four bodies discovered in December is knowledgeable of police investigative tactics and familiar with the area of Long Island where the bodies were found, according to multiple press reports. Authorities are reportedly considering that a former cop may be behind the killings.

The bodies of four women -- all in their 20s and found wrapped in burlap bags -- who worked as Craigslist escorts were found in the same area in December, but a spokeswoman with the Suffolk County Police Department told FoxNews.com that police have not determined whether the bodies found in the last two weeks are linked to those women.

Police expanded their search for more possible victims into Nassau County on Monday. About 125 searchers, some with dogs and others on horseback, scoured Jones Beach State Park for more possible victims.

The New York Post and the New York Times, citing unnamed sources, have reported that the killer may be a former cop or someone familiar with law enforcement procedure.

The person believed to be the killer had reportedly made taunting phone calls to the teen sister of victim Melissa Barthelemy shortly after she disappeared in July 2009. The calls were difficult for police to investigate because they were all under led flexible strip three minutes and made from crowded places, like Madison Square Garden and Times Square.

An official with the Suffolk County Police Department would not confirm to FoxNews.com that authorities are eyeing an ex-cop in the investigation.

"We haven’t said if we think it’s someone in law enforcement," the official said.

Criminal profilers say serial killers are often social and would appear to have a normal life with family and friends as opposed to being a loner.

The disappearance of 24-year-old N.J. resident and Craigslist escort Shannan Gilbert led investigators to the Suffolk County beach spot late last year. The skeletal bodies of female prostitutes found in December and the five unidentified bodies found recently were discovered within a three-mile radius on the north side of Ocean Parkway.

None of the found victims, however, is Gilbert, whose case remains open.

Cell phone calls made by the women are also being tracked, and computer cable ties records of their communications and appointment records have also been viewed.

A Suffolk County investigator who declined to be identified because of the ongoing case told The Associated Press that detectives are taking a methodical approach to finding the suspect, poring over credit card records of the victims to track their movements and where they spent their money in the area, MyFoxNY.com reports.

"These kinds of investigations have to take slow steps; you don't want to jump to conclusions," Katherine Ramsland, a professor of forensic psychology at DeSales University in Center Valley, Pa., and author of "The Human Predator: A Historical Chronicle of Serial Murder and Forensic Investigation," told MyFoxNY.
"They are looking at the evidence to determine what may be similar golf irons about the victims, but they also want to look at dissimilarities," she said.