Two men and a 2-year-old boy were identified as the victims found dead after a car explosion in Pennsylvania on Saturday, WPVI reported.

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The victims were identified as Jacob Schmoyer, 26; John Schmoyer, 2; and David Halman, 66; the television station reported after a Monday afternoon news conference held by authorities.

Hallman was a friend of Jacob Schmoyer, authorities said during the news conference.

Earlier, relatives confirmed to the Morning Call of Allentown that a man and his 2-year-old son were among the casualties. The relatives confirmed multiple reports on social media. Agents from the Bureau of Alcohol, Tobacco and Firearms are conducting the investigation.

In a news conference Sunday, authorities told reporters they believe the explosion was an isolated incident and that there is no continuing public threat, WPVI reported.

"We know there's been a criminal incident," District Attorney James Martin said during a news conference Sunday, according to an Associated Press report. "We have a high degree of confidence that the perpetrator was probably killed in the incident."

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