WORCESTER, Mass. (AP) — A former Massachusetts postal worker has pleaded guilty to recording himself sexually assaulting a child and viewing child pornography at work.

Federal prosecutors say 62-year-old Stephen Mantha was arrested after investigators discovered suspicious internet searches coming from a Postal Service office in Shrewsbury. Mantha worked there as an electronic technician.

Investigators searched Mantha's Spencer home in September 2016 and discovered a video recorded in 2000 or 2001 that showed him assaulting an approximately 7-year-old boy. Federal agents located the victim, now an adult, who confirmed the abuse.

Mantha entered the guilty plea Tuesday in federal court in Worcester.

Sentencing is scheduled for May 24.