Federal authorities say a Massachusetts man accused of putting pipe bomb-like devices on high-voltage power lines left a note threatening to attack other utilities and to publish instructions on how to make similar devices on the Internet.

Danny Kelly, of Chelmsford, was arrested Saturday, days after firefighters responded to a brush fire near National Grid electric power lines in Tyngsborough. Kelly is due in court Monday.

An FBI affidavit says Kelly was charged more than a decade ago with cutting approximately 18 telephone and cable lines and threatening to cut more unless he received payment. He pleaded guilty to extortion.

The affidavit says Kelly left a note in Tyngsborough saying he is going to war and threatening attacks on critical infrastructure.

It could not immediately be determined if Kelly has an attorney who could comment on his behalf.