"The Hill" is reporting that the FBI has asked the Senate for documents it obtained from abortion providers, signaling agents may be investigating whether organizations like Planned Parenthood illegally sold fetal tissue and body parts.

According to sources familiar with the document request, it was made to the Senate Judiciary Committee, whose chairman, Sen. Chuck Grassley, referred Planned Parenthood and several other abortion providers to the FBI last December for investigation after a probe into the transfers of fetal tissue.

It was said at the time the committee had uncovered enough evidence showing abortion providers had transferred tissue and body parts from aborted fetuses to firms for use in research by charging dollar amounts above their actual costs.

Under a 1993 law, abortion providers are allowed to transfer fetal tissue for research at a cost equal to the price of obtaining it, however they are not allowed to sell it at a profit.

The Justice Department would not confirm nor deny whether an investigation is taking place.