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BEAVER DAM, Wis. (AP) — The FBI is asking for help from law enforcement agencies and the public in identifying any leads about the activities and associations of the man killed in a Beaver Dam apartment explosion.

Investigators believe 28-year-old Benjamin Morrow was making bombs in his apartment when an accidental detonation took his life March 5. Authorities say they found large quantities of explosives and a variety of unstable chemicals.

The entire apartment building was burned down Thursday because the chemicals could not be removed safely.

Morrow was a quality control technician for Richelieu Foods and had previously worked as an associate scientist at PPD of Middleton, a contract research company.