Assistant Special Agent in Charge Walter Brown declined comment on the presence of the air packs and why the agents were wearing hazmat gear as they collected evidence from a house in the 100 block of Kirkland Street in Littleton.
rrspin.com had observed earlier in the day the Littleton Volunteer Fire Department bringing the air packs to the scene.
Brown said an autopsy would determine the cause of death. He said agents and the Littleton Police Department were not in a position to release the names of the three victims.
He declined comment on whether foul play is suspected.
Crime scene tape blocking the entrances to Kirkland Street had been removed this evening but there was still crime scene tape up, which cordoned off the residence where the three people were found.