updated 11/27/2009 2:14:09 PM ET 2009-11-27T19:14:09

A former anesthesiologist has admitted to making pipe bombs that were part of an arsenal seized at his apartment, federal agents say.

An affidavit filed in federal court in Akron said Mark Campano told an FBI agent that he "did indeed" build the pipe bombs found this week at his Cuyahoga Falls apartment.

Neither Campano nor the FBI agent who talked to him described a motive or possible target in the affidavit, which was filed late Wednesday.

A message seeking comment was left Friday for defense attorney Donald Hicks.

Authorities arrested Campano after an explosion rocked his apartment complex Monday night. Police said he was attempting to load shotgun shells when one blew up.

The 56-year-old Campano has a history of substance abuse dating to 1987, according to state medical board records. His Ohio medical license was revoked in 2006.

Campano was charged Wednesday with one count of unlawful possession of a pipe bomb. He agreed to waive a preliminary hearing and bond hearing.

About 35 pipe bombs, an assortment of firearms and hundreds of rounds of ammunition were found in the apartment following two loud explosions. Other apartments were evacuated, but no one else was hurt.

Campano told an officer that he was attempting to load shotgun shells when one blew up in his hands, according to a police report. He was taken to an Akron hospital with severe injuries to his left hand and arm. After he was released Wednesday, he was taken to court.

Campano completed a drug treatment program in the late 1980s, according to Ohio medical board records. He moved to West Virginia and practiced medicine there until he gave up his license in 1993 when he had a relapse involving drugs and alcohol.

Campano sought treatment again and was diagnosed with major depression, alcohol dependency, and drug abuse, records show.

Copyright 2009 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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