MADISON, Wis.--- Madison police have arrested a convicted sex offender and charged him for grabbing another man inside an East Towne Mall bathroom.

The police report says 43-year-old Gregory Ostern walked into the mall bathroom Saturday. The report says he forcefully grabbed a 21-year-old man's private areas.

The victim was able to get away and told police Ostern said he recently had gotten "out of the pen."

Ostern was arrested and charged with 2nd Degree Sexual Assault.

Court records show arrests dating back to 1992.