"It was a message with all the subtlety of a letter bomb."

Fighting the terrorists: Technology that can track down letter bombs.

According to him, people regularly send letter bombs to the station.

So far, no one has been injured by the letter bombs.

Tonight, two more letter bombs were found as workers continued to search incoming mail.

This evening, a police spokesman confirmed that they were also letter bombs.

Part of his left hand was missing, the result of a letter bomb.

A letter bomb was sent to Barker's home, but his wife saw it as suspicious and called the police.

That would explain why the letter bomb was so ineffective.

Others said they were taught how to make letter bombs.