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Horrified FBI agents uncovered a “Frankenstein monster" as they raided a body organ donation centre in Pheonix, Arizona, new lawsuits have revealed.

A woman’s head sewn on to a man’s body was among the gruesome discoveries made at Arizona's Biological Resource Center.

The agents were also confronted with buckets of arms and legs and a cooler filled with male genitalia, as they scoured the facility as part of an extensive investigation into the illegal trafficking of human body parts.

The multi-state enquiry led the FBI to the facility in 2014, but the details of the stomach-churning scenes were only released this week.

The revelations come after 33 people sued the centre over the illegal use of their loved ones’ bodies, having believed they would be used for scientific purposes.

As a result of these lawsuits, the agents’ shocking testimonies were made public, including gory details on how the bodies had been dismembered with chainsaws.

“Pools of human blood and bodily fluids were found on the floor of the freezer,” and there were no identification tags to mark the corpses, the lawsuit reportedly alleges.

One agent said he found a “cooler filled with male genitalia”, “a bucket of heads, arms and legs”, and a number of “infected heads”, according to former FBI special agent Mark Cwynar.

The agents also described seeing a small woman’s decapitated head which had been sewn onto a large male torso and hung up on a wall.

The “Frankenstein-like” creation is now reportedly referred to as the lawsuit’s “morbid joke”.

A federal search warrant stated that heads could fetch around £400 each, with arms going for more than £600.

A whole body could be sold for more than £4,000.

“This is a horror story. It’s just unbelievable,” Troy Harp, one of the complainants in the lawsuit, told US news outlet KMOV4.

Mr Harp donated both his mother and grandmother to the facility in 2012 and 2013, on the understanding the bodies would be used for the benefit of science.

“Cancer, and leukaemia and whatever else using sample cells, that’s what I was told,” he said.

Speaking of the agents’ findings, Mr Harp said: “Who in their right mind... It’s absolutely gross.”

The lawsuit alleges the illegal activity at the centre dates back to 2007, according to ABC15.

It comes after the facility's owner, Stephen Gore, was handed a suspended one-year prison sentence for conducting an illegal business in 2015.

In October 2018, he pleaded guilty to illegal control of an enterprise, and was sentenced to one year of deferred jail time and four years probation.