Thunder Bay's Fire Department feels a large blaze that consumed most of a nine unit apartment building over the weekend on Cumming Street is suspicious. Early Sunday morning, emergency responders were notified of a large fire in the vacant building. The fire is highly suspicious due to the fact that it occurred in a vacant building that is secured from intruders and under reconstruction from a previous fire. No known ignition sources were found in the building. Thunder Bay Police are now pursuing more information relating to the cause of this fire.