LAKELAND, Fla. (WFLA) – A 61-year-old man previously arrested by Polk County Sheriff’s Office detectives now has 300 new counts of possession of child pornography filed against him after a search of his personal computer and electronic devices.

Dr. Brian Birky was originally charged with nine counts of possession of children pornography when he was arrested last week.

During a forensic examination of Birky’s internal hard drive, 300 sexually explicit images depicting children between the ages of 18-months-old to 11-years-old.

The original charges against Birky were third-degree felonies, but given the total number of imagines, the additional charges are second-degree felonies.

Birky posted bond the day after his initial arrest.

After the discovery of the 300 images on his computer, he was arrested again on Thursday.

Prior to his arrest, he worked as the Executive Director for Public and Environmental Health Resarch at the Florida Industrial and Phosphate Research Institute in Bartow.

The initial investigation began following a tip from the National Center for Missing and Exploited Children that child pornography files were allegedly associated with an IP address at Birky’s home on Peninsular Drive.