The victim, who wished to remain anonymous, was checking his phone for emails, heard someone running up behind him, and felt a hard blow along the side of his face, knocking him to the ground.
There were no reports of injuries, according to the police, and no other people were being sought in relation to the incident.
The Abington Township Police Department said there was an explosion within the building and flames could be seen inside the warehouse structure, citing statements from witnesses.
A ceremony marking the agreement was held last week in Washington, DC, with 150 sheriffs from across the United States and senior ZAKA officials, led by CEO Dubi Weissensetrn.
The police are investigating whether the suspect was wearing an explosive belt and whether he was planning to carry out a terror attack.
The driver had appended to the car a sticker in support of the hostages held in Gaza captivity to render it less suspect.
The two men were plotting an attack on civilians and security forces, and both expressed support for Hamas following the October 7 massacre.