http://m.nbcnewyork.com/nbcnewyork/pm_107766/contentdetail.htm?contentguid=78DMnk3O Police have arrested a Brooklyn man on charges he sexually abused two young girls in a public library. Authorities took 49-year-old Joel Grubert into custody on Saturday. Police say that on June 23, he was in a library in Flushing when he approached two girls, one 6, the other 9, and inappropriately touched them. Grubert is charged with sexual abuse and endangering the welfare of a child. According to the state sex offender database, Grubert has a history of molesting young girls and possessing child pornography. In 2004 he was arrested and convicted for possessing a sexual performance by a child less than 16 years of age, according to the Public Registry of Sex Offenders. No information on an attorney was immediately available.