Rescue teams mysteriously digging in the rubble of a Massachusetts condominium on Sunday night reported Monday found a man's body, two explosives, and several propane tanks.
The crews stopped demolishing the building in Fitchburg, about 90 kilometers west of Boston, after discovering a corpse on the third floor under a collapsed roof section, Boston's WFXT reported.
The discovery was confirmed by the District Attorney of Worcester Joseph D. Früh at a press conference on Monday.
"The cause and origin of the fire has yet to be determined, although we found two improvised explosives, also known as IEDs, in the home," said Early. "It seemed everyone who put them together knew what they were doing."
The remains were taken to a chief physician to perform an autopsy, WFXT reported. The identity of the victim and the causes of the fire remain unclear.
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"We phoned his previous workplace to warn them with great caution," he said.
Neighbors quoted by WFXT reported an explosion before the apartment went up in flames at around 6:00 pm.
At least 60 people were displaced while the crews went through the night to fight the flames, the Republican reported. Clouds of smoke were supposed to be seen four meters away.
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The Worcester County Attorney's Office and the State Fire Department cooperate with the local police and firefighters in the investigation.