Oct. 7, 2011— -- The search for missing toddler Lisa Irwin moved to a Missouri landfill today just hours after the girl's mother said police have accused her of doing something to her daughter.
Kansas City police and FBI agents began combing through the Johnson County landfill known officially as Deffenbaugh Industries.
"We were out there searching the landfill today," Bridget Patton, spokeswoman for the FBI's Kansas City Division, told ABCNews.com.
When asked if the search was related to the disappearance of 10-month-old Lisa Irwin, Patton said, "Yeah, it's related to that."
Patton said this was the second time this week the FBI has searched the landfill.
Earlier today, Lisa's mother said that police accused her of having done something to her child.
"From the start when they've questioned me, once I couldn't fill in gaps, it turned into 'You did it, you did it,'" Deborah Bradley told "Good Morning America." "They took a picture down from the table and said, 'Look at your baby! And do what's right for her!' I kept saying I don't know ... I just sat there. I didn't even ask to leave. I just let them keep asking questions."
Bradley also said police accused her of failing a polygraph test. Police said they could not comment on this claim, but said Bradley is "free to say whatever she wants."
The child vanished from her crib four days ago and police have said they literally do not have a clue about where Lisa is or who took her.
Bradley, who sobbed through her interview with "GMA," spoke out after Kansas City police said Bradley and the toddler's father Jeremy Irwin had stopped cooperating.
The parents told "GMA" they have not ended their cooperation with police.
"If they say they're willing to continue speaking with detectives, I say great. Our door is open," Police Capt. Steve Young told ABCNews.com this morning. "Their involvement in the case is the best thing for this case. Our only goal is to find this little girl."
Young said detectives would be happy to resume conversations with Lisa's parents, but added, "We still haven't heard from the mother or father as of this morning."
Irwin said that he needed to take a break from the intensive questioning and soon saw a police press conference where they stated that the parents had ceased to work with police on the investigation.
"We were in interrogated for a really long time Tuesday there again, answering questions….I just couldn't' take it anymore," he said. "I told them I had to have a break -- no more questions today. I asked to be let go, and they let me go from police station. An hour later was when we saw the press conference from them."
Both parents vehemently denied on "GMA" that they had any involvement with their daughter's disappearance, and reiterated their willingness to cooperate.
"We continue to ask, answer all the questions the best we can and do everything they tell us to do and so I mean, we've done everything we can do," Bradley said.
That conflicted with what Kansas City, Mo., police Capt. Steve Young said earlier.
"The mother and father no longer want to talk to detectives," Young said. "From an investigative standpoint, we enjoyed their cooperation. So far, [it] has been very beneficial to the case. But yeah, you can imagine it doesn't help the case" [that the cooperation has ended].
"Like I've said before, the cooperation of the parents is -- they live in the house. They intimately have information of what's been going on. They know the child. They were maybe one of our best bets to help find this child," Young said. "This doesn't help the investigation."
Thursday night police also shut down their outdoor command post and removed that crime scene tape that had been surrounding the house since Lisa's disappearance, but police insist this was not related to their claim that the parents were no longer cooperating.
"It has nothing to do with the statement I made about the parents' cooperation," Young said. "We closed that down only because of geography."
Young said the investigation is continuing with the same force but has simply moved to the police station as a matter of convenience.
Police have said that they are still investigating what happened at the house Monday night when the baby, who the couple nicknamed "Pumpkin Pie," disappeared from her crib.
Young confirms what the police have said since their initial questioning of the parents earlier this week, that they are not suspects in their child's disappearance.
"The investigation is directed and led by hard information," Young added. "Again, we don't have any suspects. If we had enough to charge anybody with, we probably would be issuing charges."
The dispute over whether Bradley and Irwin were cooperating came after ABC News learned the couple was trying to make lists of possible suspects for police by thinking about all of the people they cross paths with on a daily basis. That meant they were listing every grocer, utility worker who may have been in the house, former friend, classmate, neighbor or acquaintances who may have wanted a child.
Baby Lisa's Parents Insist They Are Still Cooperating
They were trying to remember if anyone ever took particular interest in their little girl who was last seen by Bradley on Monday night when she put Lisa to bed at the family home.
Little by little, details have emerged about the mysterious events of Monday night.
The parents revealed that their cell phones were missing when they frantically tried to call 911 after discovering that their "Pumpkin Pie" was not in her crib.
"The windows were open and lights were on and she was nowhere to be found," Irwin told "Good Morning America" Thursday. "We've been going over everything in our minds. We just don't have any idea."
Irwin said that his front door was unlocked when he returned home from work as an electrician at 4 a.m. to find his daughter missing.
Irwin said that this was the first night he had ever worked the overnight shift and Bradley said it was the first night she had ever left the door unlocked.
Bradley also described to "Good Morning America" how two other children from previous relationships who live in the house have been handling the situation.
"They were crying and asking where [Lisa] was," Bradley said through tears. "My 8-year-old, who's usually really strong, he kind of fell apart. We call her Pumpkin Pie and he said, 'Where's Pumpkin Pie, Mom?' And I couldn't tell him."
"Please. She has a family who loves her very much," Bradley cried. "Take her somewhere safe. Take her to a church, a hospital, a fire department. Just drop her off with somebody and then leave, no questions asked. We just want our baby back."
Ernie Allen of the National Center for Missing and Exploited Children said that infant abduction cases are relatively rare. There have been 278 documented cases in which newborns or infants have been abducted since 1983.
Anyone with information on Lisa's disappearance should call the Kansas City Police Department hotline at 816-474-TIPS.
ABC News' Dan Harris and Michael S. James contributed to this report.