WCAU-TV reports ( http://bit.ly/J3hC3Q) that officers were called to the Burkholder Farm Market in Berks County at around 4 p.m. Sunday.
The coroner's office tells the station that John Edward Burkholder died from asphyxiation and that his death was an accident.
The Berks-Lehigh Regional Police haven't yet said what kind of farm equipment the boy was playing with. The accident is under investigation.
Information from: WCAU-TV, http://www.nbc10.com