(CNN) A father and his young son were identified Monday as among the three victims of a car explosion over the weekend in Pennsylvania.

Jacob Schmoyer, 26, and his 2-year-old son, Jonathan, were killed in the explosion Saturday in Allentown, Lehigh County Coroner Scott Grim told reporters. Grim identified the third victim as 66-year-old David Hallman.

The three Allentown residents died from traumatic injuries caused by the explosion, Grim said.

Schmoyer and Hallman were friends, according to Don Robinson, special agent in charge of the Bureau of Alcohol, Tobacco, Firearms and Explosives Philadelphia field office.

"We have a high degree of confidence that the perpetrator was probably killed in the incident," Lehigh County District Attorney James Martin told CNN affiliate WFMZ earlier.

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