ORLANDO, Fla. -- The grandparents of a missing Orlando girl lashed out at news reporters Thursday over a question yelled at them as they walked to see the child's jailed mother.

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IMAGES: Caylee Photos | Casey Photos Surface

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"Do you have anything to say about a new theory that Caylee (Anthony) may be dead and that it may be an accident?" a reporter asked.

"Shut up," George Anthony screamed as he moved toward the reporter. "Shut up."

Caylee's grandmother, Cindy, stepped between her husband and the reporter. She then said the media has hampered tips from the public before walking off.

"That is the reason why I got a phone call at 11 p.m. last night and the lady was crying because of that kind of stuff on the news that she held back for four weeks calling in a tip because she was afraid and they spotted Caylee again."

George and Cindy Anthony spent 45 minutes on a video conference call with their daughter at the jail. Both left the Orange County Jail without comment.

Mom Stopped Mentioning Caylee

Meanwhile, an interview with a former roommate of Casey Anthony's boyfriend shed some light on how the woman acted while her daughter was missing and before her mother called the authorities.

A man named Clint House -- a former roommate of Casey Anthony's boyfriend, Tony Lazarro -- spoke to Fox News about the woman's demeanor.

"Between June 16 and July 1 when you moved out, was Casey still coming to see Tony and spending the night?" Fox News anchor Greta Van Susteren said.

"Yes, it became more frequent and being almost every single night she was staying there," House said.

"Do you remember that week, right after Father's Day?" Van Susteren asked. "Anything unusual that week?"

"Nothing unusual besides the fact that Caylee was never there anymore," House said. "We always asked where Caylee is at, (and she'd say) 'Oh, she's with the grandparents or she's at the beach with the nanny. That didn't strike me as unusual at the time. Other than that, nothing."

House continued to say that at a certain point Casey Anthony stopped mentioning Caylee even when they asked about her.

He said looking back at the events, some of Anthony's behavior is troubling.

"Wouldn't you be surprised if someone who was hanging out with you and your friends, all of the sudden her daughter is missing and she is out partying?" House said.

House said Casey Anthony claimed she went to work every day and that she was going back to school.

He said she told him the child's father was on the way to Caylee's birthday party and was killed in a car crash but added that he had no way of knowing whether or not she was lying.

Detectives Zero In On Calls

Also, detectives are zeroing in on Casey Anthony's cell phone records, Local 6 has learned.

Casey Anthony's cell phone records from June 16 -- the day investigators believe something may have happened to her daughter Caylee -- show she made nearly a dozen calls in less than five hours, records obtained by Fox News Channel showed.

Anthony called her mother seven times, her dad once, her boyfriend and two other friends, the records showed.

The woman's cell records from June 17 were not available but on June 18, the records showed Casey Anthony tried calling her mom and dad six times in less than an hour.

Investigators are using cell-tower mapping to pinpoint the areas where the calls were made.

Attorney Questions Timeline

Casey Anthony's attorney, Jose Baez, said he finds it odd that investigators are zeroing in on three dates in June.

Video shot on June 15 shows Caylee Anthony reading a book at a table.

However, deputies are pointing to June 16 as the day something happened to Caylee, Local 6's Erik von Ancken said.

Detectives said on June 17, Casey Anthony borrowed a shovel from a neighbor and on June 18 the woman was spotted backing up her car to her family's garage.

"I have not heard that theory," Cindy Anthony said. "Out of their mouths today, to me, all of them (said) they're looking for a missing child. That's what I'm doing. I'm looking for a missing child. And that is what I'm asking the public to do."

Publicly, the Orange County Sheriff's Office said 100 percent of their resources are going into finding Caylee Anthony.

Privately, detectives admitted that Casey Anthony is just as much a focus of their investigation, Local 6 reported.

Cadaver Dogs Records Requested

During the initial investigation into Caylee Anthony's investigation, two different cadaver dogs hit on the same spot in the child's grandparents back yard.

Deputies said the dogs were trained to locate gases given off by a decomposing human.

However, the missing child's grandmother said the dogs could have been confused by their handlers.

"I went online this morning and read up on a lot of cadaver dogs," Cindy Anthony said on in July. "Cadaver dogs could be cued by their owner."

Local 6 has learned that Baez has filed a motion asking for all background information on the dogs, including their training records.

Watch Local 6 News for more on this story.