SEATTLE (AP) -- Federal authorities say they found more than 100 guns at the home of a former Boeing worker charged with sending bomb threats to the company as well as an oil refinery.

A grand jury returned a 16-count indictment Thursday against 46-year-old Gino Augustus Turrella, of Des Moines, charging him with making threats and identity theft. He was arrested Tuesday at an REI parking lot.

A spokeswoman for Chicago-based Boeing says Turrella worked as a flexible machine operator in Auburn, Washington, from August 1987 to August 2005. The FBI says he had a history of making threats to managers and top executives, including sending live AK-47 ammunition cartridges to his former manager.

(Copyright 2008 by The Associated Press. All Rights Reserved.)