There was such a disconnect between the visual cue and the voice on the other end it took Mark Walker a few seconds to gather his thoughts.

The name on his iPhone showed an incoming call from Walker’s daughter, Rachel, but the voice coming out when he answered was that of a manic, excitable man screaming demands for cash and threatening violence. He appeared to have his daughter and her phone.

“He says he’s going to kill my daughter unless I get him $1,000 fast,” Walker, 57, of Noblesville, Indiana, said. “This sudden confusion flushes over you. I knew she was on her way to school to pick up the twins. Could something have happened on the way? I’m thinking a lot of things at once.”

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The call lasted two minutes with the man ranting and raving the whole time. He demanded that Walker go to Walmart and send a money gram for $1,000.

But after about 30 seconds Walker, a private investigator, was able to slow his heart beat and gather his bearings. He asked to talk to his 34-year-old daughter, and the man refused.

“That was the first red flag,” Walker said. Then he had his wife call his daughter from another phone. She promptly answered.

That told Walker he was the victim of a scam, and he was right.

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Virtual kidnapping begins with hackers

The FBI calls the crime "virtual kidnapping." Hackers gain access to mobile phone contact lists and then use phone-disguising technology to appear as if they are calling from the purported kidnapping victim's phone.

FBI Indianapolis Supervisory Special Agent Doug Kasper said the scam is the latest, fright-inducing evolution of phone and social networking schemes operated by overseas criminal networks.

"This is the next level," Kasper said. "This is a high pressure call that has instant impact. The ability to spoof phone numbers is what makes it so instantly scary."

Kasper said the FBI is continually taking down the networks and their money launderers in the United States but they keep evolving.

"They grow more sophisticated all the time, but on our side is that the consumers are also getting more sophisticated in recognizing them," he said. "The key for the victims is to slow things down, control your emotions."

The FBI doesn't have national statistics on virtual kidnapping because most victims report the crime to local police or don’t report it at all. Because the FBI believes the scam is still prevalent, agents are encouraging the public to report the calls.

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Extortion attempt

Walker said he was suspicious because the extortion requested only $1,000.

“No one is going to kidnap someone for just $1,000,” Walker said. “It’s not worth it.”

Kasper said the low dollar demand "was a telling sign."

"Along with requests for Apple cards and things like that," he added.

Walker also said the caller never identified Rachel as his daughter or he as her father. “He kept saying, 'You know Rachel,’” Walker said.

Adding to the confusion, he said, while he was listening to Rachel’s purported kidnapper, Walker got a call from his son who was being extorted on his phone by someone saying he had kidnapped Walker.

He surmised that the scammers probably rapidly dial dozens of potential victims in one day hoping to get a hit on one. He said he was probably lucky that he was able to reach his daughter.

“That kind of ruins it for the virtual kidnapper, but they probably keep making calls until they find the one that is unable to get ahold of their loved ones and panics,” he said.

Kasper called the trickery a "high volume" scheme that has enough success that to keep going is in the scammers' interest.

How to spot virtual kidnapping

The FBI offers these suggestions if you think you are the victim of virtual kidnapping: