Man at large after sexually assaulting 21-year-old woman sunbathing in Central Park

The young woman was alone when she was attacked Monday afternoon, according to ABC .
Police released a sketch of the man who sexually assaulted a woman while she was sunbathing earlier this week in Central Park.
The NYPD said the man exposed himself and then tackled the woman.
It happened in broad daylight Monday near West Drive and 104th Street on Manhattan’s Upper West Side.