A former supervisory FBI agent has been arrested and jailed on child pornography charges. Donald Sachtleben was taken into custody and charged ... after a nationwide undercover investigation of illegal child porn images traded over the Internet. The 54-year-old resident of Carmel, Indiana, has pleaded not guilty. A federal complaint alleges 30 graphic images and video were found on Sachtleben's laptop computer late last week when FBI agents searched his home, about 23 miles north of Indianapolis. The arrest was a result a months-long probe, said the U.S. attorney for the Southern District of Indiana, Joseph Hogsett. The mission of our Project Safe Childhood initiative is to investigate and prosecute anyone found to (be) engaged in the sexual exploitation of children," Hogsett said in a news release. "No matter who you are, you will be brought to justice if you are found guilty of such criminal behavior." Sachtleben is currently an Oklahoma State University visiting professor, according to his online resume. He is director of training at the school's Center for Improvised Explosives. He had been an FBI special agent from 1983 to 2008, serving as a bomb technician. He worked on the Oklahoma City bombing and Unabomber investigations, according to his university biography. The Justice Department's Project Safe Childhood initiative was launched in 2006, leading to what federal officials call a more than 40% increase in the number of cases investigated. The project's website says 2,700 indictments were filed last year alone.