An Ohio man injured last month when two explosions rocked his apartment has been indicted on a federal charge of possessing dozens of pipe bombs.

U.S. Attorney Steven Dettlebach says the grand jury returned a one-count indictment Tuesday against 56-year-old Mark Campano of Cuyahoga (ky-uh-HOH'-guh) Falls near Akron.

He's charged with having about 37 unregistered pipe bombs and a homemade gun silencer.

The former doctor, who practiced in Ohio and West Virginia, was arrested last month after two explosions ripped through his apartment.

Campano's attorney said Tuesday he did not want to comment because he had not had a chance to review the indictment. Campano's mother said last month that her son didn't intend to harm anyone and detonated the devices in remote areas as a hobby.