Multiple killers in Long Island beach murders?

Police in Long Island have now revealed that the 10 sets of human remains discovered along a desolate stretch of beach may be the work of multiple killers.

Suffolk County District Attorney Thomas Spota said, "What is now very clear is that the area in and around Gilgo Beach has been used to discard human remains for some period of time."

While investigators once thought the murders were the work of a lone serial killer, CBS News Correspondent Elaine Quijano reports, police now say that the isolated area appears to be the site of a dumping ground, spanning several years.

Two killers - at least - are responsible for remains near Long Island beach, D.A. says

Spota said, "As distasteful and disturbing as that is, there is no evidence that all of these remains are that of a single killer."

Among the most recent sets of remains discovered was the head and hands of a missing woman named Jessica Taylor. She had been working as a prostitute in New York City when she disappeared. Her torso was found 40 miles away in 2003.

Police believe Taylor's death, and that of a man whose body has yet to be identified are unrelated to the other eight bodies found in the area. Four of the women have been identified -- all in their 20s and all of whom advertised escort services on Craigslist and had been missing from as far back as 2007.

Lynn Barthelemy, the mother of a victim, said, "I just know that he's a sick individual and needs to be caught as soon as possible."

One of the best leads continues to be the phone calls a man placed to Amanda Barthelemy, the sister of one of the victims. But so far, investigators have not identified a suspect.

On "The Early Show," criminologist Casey Jordan said an oversight she believes police may have made is not following up on the phone call made to Barthelemy.

Jordan said, "We know that they did not go with any voice samples from suspects to talk to the younger sister, Amanda Barthelemy, who got those disturbing phone calls from the killer who killed her sister. There are going to be little things that they should be doing to keep trying to stitch these things together and figure out if some of the murders are related."

However, Jordan said it's not known how many killers could be dumping bodies in the beach side area.

"Unfortunately, the area is very conducive to be a dumping ground, not just for bodies, but for all kinds of garbage," she said. "We don't doubt that the four women found over at Oak Beach are the work of the same killer. But every piece of human remains since then, is totally open to question as to who the culprit is."

She continued, "... We don't know the identity of human remains number five, including number eight, number nine, number 10, those found in Nassau (County) have not been identified. The police have cut their work cut out for them. But having identified Jessica Taylor as the woman in Gilgo Beach, in the same proximity as the body of a child and an Asian man who died, quote, 'a violent death.' And for the police to say those three bodies are totally unrelated, and Jessica Taylor's torso was found 40 miles away eight years ago ... seems to really raise the question all three of those bodies are the work of three different people. But then the question remains, with the dismemberment of Jessica Taylor, there are two other unsolved dismemberment cases. Perhaps you're dealing with an entirely separate serial killer there that is unrelated to the Oak Beach serial killer."

"Early Show" co-anchor Chris Wragge remarked, "This is the thing that's troubling -- there are no clues left behind in any of the cases. If these are separate serial killers, they're very thorough in covering their own tracks."

Jordan said, "That's what's so disturbing about Jessica Taylor. Whoever killed her took the trouble to dismember her, leave her torso in Manorville and then dump her head and her hands 40 miles away. Now there have been two other case, one from '97, one from 2007, where torsos have also been found in the water with legs and other body parts found later. So the dismemberment cases - two of whom are still unidentified - may all come together and link with Jessica Taylor."

Police investigators, Jordan said, have their work cut out for them with forensics in these cases.

She added, "The one thing they should never discount is talking to the victims' families and using the public to try to get clues. You'd be amazed how many of the cases are actually solved because somebody calls in with a clue that links everybody together."