By Tony Hanson

WARRINGTON, Pa. (CBS) — A Bucks County, Pa. man today pleaded guilty to possession of pipe bombs.  The devices were found in the home the defendant shared with his mother, and prompted the evacuation of about a dozen homes in the neighborhood.

Authorities say a continuing domestic dispute, and then the discovery of one suspicious device in the kitchen, prompted a call to police.  And that led to the arrest of 50-year-old John Grzyminski (see related stories).

Authorities found two more devices upstairs, and federal prosecutor Judy Smith says they were found to be explosive.

“It was the expert opinion at ATF that they were pipe bombs,” Smith tells KYW Newsradio.  “The bombs were rendered safe at the scene, and they were later sent to the ATF labs.”

Did they contain explosive powder?

(Smith:)  “Yes they did.”

Authorities say Grzyminski told authorities the devices were fireworks, or he threw them into lakes for entertainment, or he used them for bear hunting — although Smith points out that Grzyminski did not have a bear hunting license and it’s not legal to hunt bears with explosives in Pennsylvania anyway.