Investigators in the search for a serial killer in Daytona Beach, Fla., have created databases of area prostitutes and their customers and are subjecting the men and women to a new line of questioning in the case, Local 6 News has learned.

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IMAGES: Victim Photos
IMAGES: Prostitutes Hunt Serial Killer

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"We are asking them questions," Daytona Beach police Capt. Brian Skipper said. "I don't want to get into specifically what we are asking them but we are picking their brains basically to see if they have any information that we can use."

Local 6 News reported that a group of men recently arrested on solicitation charges in the area were apparently questioned about the deaths of Iwana Patton, Laquetta Gunther and Julie Green.

The three women are believed to have entered the killer's vehicle before they were found shot to death.

The serial killer's last victim was killed at the end of February.

Sources told Local 6 News that all three victims were shot at close range by someone who likely frequents the streets.

"It is quite possible that these girls know who is doing this, they just don't realize it," Skipper said. "So, it takes an investigator to prime them a little bit."

"Detectives are creating databases of prostitutes and their customers and reviewing the information," Local 6 reporter Tarik Minor said.

Several residents in the area remain concerned about the serial killer, Local 6 News reported.

"There is some sick man out there killing people for no reason at all," resident Sheila Marra said. "I don't understand why he is picking on women. I was tempted to go out and buy a BB-gun the other day because I don't know what this guy looks like, I don't know his image. I can tell one thing, he is a very sick man."

Marra said she fears the killer will move out of Florida and target prostitutes in other areas of the United States.

Local 6 News reported that the FBI is investigating tips received from out-of-state callers.

"Detectives with the Daytona Beach Police Department said that this case by far has not gone cold and they are receiving new information every day," Minor said.

Watch Local 6 News for more on this story.