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Maryland police have a man in custody and syringes full of semen in evidence after a bizarre attack at a grocery store last month, when the suspect allegedly injected something into an unsuspecting woman’s buttocks.

Thomas Bryon Stemen, 51, is facing charges of first-degree assault, second-degree assault and reckless endangerment in connection with the Feb. 18 incident, the Anne Arundel County Police Department said in a news release. Stemen was arrested last week after police released footage of a man appearing to jab a woman in the buttocks with a syringe.

Police say syringes recovered during the arrest have tested positive for semen.

“The substance in the syringe was semen,” police said in an update to their initial press release on Saturday. However, they later told local station WJZ that they’re not certain whether they’ve recovered the actual syringe used in the attack.

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This undated photo provided by the Anne Arundel County Police Department shows Thomas Bryon Stemen. Anne Arundel County Police Department via AP

“We are unsure if any of those were the syringe in question,” police told the station in what they said was an update to their initial statement. They say the victim is still undergoing testing.

“We need to find out … what this victim is up against, if she was stabbed with one of those semen-filled syringes,” Anne Arundel County Police Sgt. Jacklyn Davis told the station.

Security footage shows the moment when Stemen allegedly stabbed the victim, Katie Peters, with a syringe at the entrance to Christopher’s Fine Foods in Churchton, Md.

A man is shown holding a suspected syringe before jabbing it into the woman shown at a grocery store in Churchton, Md., on Feb. 18, 2020. Anne Arundel County Police Department/Facebook

In the video, Peters pushes a shopping cart into the store and returns it to the lineup of empty carts, seemingly unaware of the suspect following a few paces behind her. He can be seen holding a cylindrical object in one hand. The suspect walks behind Peters, pivots and appears to jab her in the buttocks with the object, which police say was a syringe.

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Peters can be seen jumping as though she’s been stung. She says she let out a yelp after the attack, which she initially thought was from a lit cigarette.

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“He turned to me and said, ‘I know it feels like a bee sting, doesn’t it?’” Peters told WJZ.

She says she felt discomfort shortly after the incident and found a puncture wound on her behind.

“I started driving home [and] it started hurting really bad,” she told WJZ. “I called my son and said, ‘Something’s not right. I hope nothing happens. I hope I make it home. I love you.'”

A man appears to jab a possible syringe into a woman as he walks past her at a store in Churchton, Md., on Feb. 18, 2020. Anne Arundel County Police Department/Facebook

Peters says she went through several days of fear and uncertainty while she waited for police to find out what she’d been injected with.

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Police recovered a syringe full of semen from the suspect’s car, WBAL TV reports.

Authorities have not indicated whether the syringes were filled with Stemen’s semen.

He is being held without bail at the county jail, records show. Stemen is scheduled to appear in court on Monday.

The investigation is ongoing.