The Bureau of Alcohol, Tobacco and Firearms has concluded a nearly five-month investigation of a fire at the former Weaver Piano and Organ Company without determining the cause.
The ATF said a specific point of origin and ignition source could not be identified due to the extensive damage and lack of evidence.
The fire in the 100 block of North Broad Street on March 21 has been classified as ‘undetermined.”
A second federal agency, The National Institute for Occupational Safety and Health, continues to investigate the deaths of two York firefighters at the site the following day.
Ivan Flanscha, 50, and Zachary Anthony, 29, died and two other firefighters were injured when the fourth floor of the building collapsed.
NIOSH is part of the U.S. Centers for Disease Control and Prevention. It conducts research to reduce work-related illness and injury.
The NIOSH investigation is examining, among other things, why the firefighters were in the building and who ordered them there.