August 17, 2016 04:40 PM

A 47-year-old woman is facing criminal charges in Pennsylvania after allegedly giving investigators disparate, conflicting accounts of what happened to her twin children, who haven’t been seen in more than a decade and are now teenagers, PEOPLE confirms.

According to Chief Howard Burton of the Penn Hills Police Department, authorities have no idea what happened to Patricia Fowler’s son and daughter, Ivon and Inisha, who relatives say vanished without a trace more than 10 years ago. Fowler is charged with endangering the welfare of children and obstructing a child welfare investigation.

Burton tells PEOPLE authorities in Pennsylvania aren’t sure what to make of Patricia Fowler’s stories concerning the fraternal twins’ whereabouts, noting she ended up recanting all three explanations she gave investigators.

“We have so many stories from her,” Burton says. “She told us she gave them to an uncle in North Carolina to raise and then said she handed them over to a friend in South Carolina. She also stated that she’d sold them to a woman for $2,000. When we informed her it was illegal to do that, she said, ‘I didn’t sell them then.'”

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Local authorities have requested assistance from the FBI as they attempt to locate the missing brother and sister.

According to Burton, officials from Child Protective Services started investigating Fowler in June when she failed to comply with a court order requiring her to take her children to a doctor for treatment. A decision was made to remove four children from her home, Burton says. But a closer look at her file revealed Fowler had two additional children who weren’t living with her.

Burton says police are trying to locate the two children, who, records show, were never enrolled in school. An extensive search for the twins will be launched soon, he says.

The investigation will be complicated because Fowler has moved “several” times over the last 10 years, according to Burton.

“She has lived at so many places over last ten years, and the last time anyone saw them, they were 3- or 4-years-old,” Burton says. “We spoke with Fowler’s 25-year-old daughter who remembers coming home from school one day, and the twins were gone. That was it.”

Burton tells PEOPLE Ivon Fowler suffered second and third degree burns over nearly half of his body when he was 2. Fowler allegedly told police the burns were accidental and caused by scalding bath water.

Fowler has a first court appearance scheduled for next week. It was unknown Wednesday if she has an attorney.

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