After the first explosion, the fire spread to two fuel tanks and a nearby house, leading authorities to evacuate everyone within a radius of 700 meters.
The evacuation order was subsequently lifted after firefighters stopped the forward movement of the fire.
The bodies were found near the sprawling Dadia forest in the northeastern Evros region, a popular route for migrants from the Middle East and Asia.
The wind-whipped firestorm that raged through Lahaina in west Maui killed at least 111 people in a death toll that is still mounting.
Dekel Marciano passed away two days after his colleague Adnan Asad, from the Druze village of Beit Jann, died after falling into a pit during a rescue mission.
Ramat Hasharon Mayor Avi Gruber said the explosion was caused by a work accident at an Elbit factory east of Highway 4.
A firefighter was killed and another was critically injured during unsuccessful attempts to save the life of a man who fell into the pit on Sunday.
"The tourist paradise turned into a hell on earth," recounted Eden Brook-Adams.
The fire appeared mainly confined to the top floor of the Ministry of Religious Endowments, although flames were seen shooting out of a second floor window as well.
Fires have broken out across seven different locations in Israel's north.