An F-B-I affidavit says the Minnesota man accused of being the mailbox bomber has confessed to planting 18 pipe bombs in five states. Several people were injured when some of the devices exploded in Illinois and Iowa. The F-B-I says in court papers that 21-year-old Luke Helder used a map to point to towns where he placed the bombs in Illinois and Iowa. He was arrested in Nevada. That is Thomas Heffelfinger, the U-S Attorney for Minnesota.