Officials from the New York Police Department (Nypd) have found "no evidence" to support Amanda Bynes' claims that she was mistreated by one of the cops who arrested her in New York last week (begs20May13).

The Hairspray star was taken into custody at her Manhattan apartment and later charged on suspicion of marijuana possession, attempted tampering with physical evidence and reckless endangerment, after allegedly throwing a bong out of the window.

Bynes later took to her page to rant about the arrest, claiming she was "sexually harassed" by a male officer who she alleges "slapped my vagina".

Police chiefs launched an investigation into the actress' allegations and announced on Monday (27May13) that they found no evidence to support her statement.

Nypd spokesman Paul Browne said, "Internal Affairs investigators have found no evidence to corroborate Ms. Bynes' allegations. 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."

Bynes, who was taken to Roosevelt Hospital for a psychiatric evaluation after her arrest, was released on her own recognisance after appearing in court in Manhattan on Friday morning (24May13).