UNIVERSITY PARK, Md. (AP) — A former University Park mayor has been charged with 28 counts of child sexual abuse material after authorities raided his home Monday, according to local news reports. The Baltimore Sun reports that the investigation by state and federal authorities began while Joel Biermann was still mayor of the small town in Prince George’s County. His successor took office in June after city elections. Biermann is accused of exchanging inappropriate messages on Facebook in which he requested sexually explicit material. An email seeking comment was sent to the Maryland Public Defender’s Office, which represents Biermann.