PROVIDENCE, Rhode Island (CBS) — Police are investigating the sexual assault of a woman who woke up half-naked in a car in Providence with no memory of how she got there.

Providence Police Major David Lapatin said the woman told them she had taken a party bus from Lawrence, Massachusetts on Saturday night to go to Club Ultra, where she believes she was drugged.

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The 23-year-old woman told police she woke up in the back seat of a white car without license plates in the back yard of a Mount Pleasant home, four miles from the club, without her pants or underwear. She said the last thing she remembered was buying a drink Saturday night.

Ultra in Providence, where a Massachusetts woman says she was drugged before being sexually assaulted. (WBZ-TV)

Ultra in Providence, where a Massachusetts woman says she was drugged before being sexually assaulted. (WBZ-TV)

She said that, after she awoke in the car, a young man approached her, said he’d washed her clothes, and gave her a blanket and pair of basketball shorts.

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When she asked to borrow the young man’s cell phone, she told police, she saw photos on it of herself, unconscious and half naked.

A family friend then came to take her, and her mother took her to Women and Infants Hospital in Providence and then to report the assault to police.

Police said that, when she came to the station early Monday morning to report the assault, she had a swollen eye and scratches on her body.

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Major Lapatin said investigators are talking to several persons of interest in the case. He said that, aside from occasional fights, the club the woman went to does not have a history of problems.