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(CBS NEWS) An investigation launched by the New York Police Department's Internal Affairs Bureau has concluded that Amanda Bynes was not sexually assaulted during herarrestlast week.

Bynes had claimed onTwitterSaturday that she was "sexually harassed by one of the cops" who arrested her at her Manhattan apartment Thursday night.An official investigation was launchedby the NYPD following the actress' claims.

"Internal Affairs investigators have found no evidence to corroborate Ms. Bynes' allegations," the NYPD said in a statement. "To the contrary, a credible civilian witness who was with the officers throughout told investigators that none touched Ms. Bynes inappropriately or otherwise engaged in misconduct at any time."

The 27-year-old former child star was arrested at her home aftershe allegedly tossed a marijuana bong out of a windowfrom the 36th floor of her high-rise apartment building.

Bynes was also accused of smoking marijuana in the building's lobby. She's since been charged with reckless endangerment, attempted tampering with evidence and unlawful possession of marijuana.

Bynes has steadfastly denied any wrongdoing and says she plans tofile a lawsuit against the NYPDover the incident.

This isn't the only legal issue she's recently had to face.

Earlier this month, Bynes was slapped with athree year probation sentencein Los Angeles for driving with a suspended license. She's also faced several hit-and-run allegations in the past along withan arrest in a still-pending DUI case.

The actress' public behavior has also drawn notice. A source told CBSNews.com that Bynes was spotted in the lobby of a Hasbrouck Heights, N.J., hotel Monday night, sporting an uncombed brown wig and talking to herself. Hotel staff told the source that Bynes had been staying at the hotel for about four days and had been referring to herself as "Amy."

Bynes first came in to the public spotlight in 1996 when she made her debut as a regular performer on the Nickelodeon sketch comedy series "All That." She went on to star on"The Amanda Show"from 1999-2002 and the sitcom "What I Like About You" from 2002 to 2006. Her most recent film role was in the 2010 comedy "Easy A." Bynes' career has been sidelined over the last several years due to her personal and legal setbacks.

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