In many countries making or having a pipe bomb is a serious crime.
Notable incidents
On 4 May 1886 a pipe bomb was thrown during a rally at Haymarket Square in Chicago, Illinois, United States. It reached a police line and exploded, killing policeman Mathias J. Degan.
On 20 October 1930 William Kogut, an inmate on San Quentin's death row, tore up decks of playing cards. He used them to make a pipe bomb, which he used to kill himself.
On 25 July 1997, during the July 1997 riots in Northern Ireland, a well-known loyalist was found dead in Belfast. He is thought to have died in a premature pipe bomb explosion at an arms dump.
On 5 June 1999 a Protestant civilian was killed when a pipe bomb was thrown through the window of her house in Portadown, Northern Ireland. She was married to a Catholic man. Loyalist Volunteer Force (LVF) members were blamed, although the group said they were not responsible.
On 11 November 2001 an Ulster Defence Association (UDA) member died in a premature pipe bomb explosion during a riot in Belfast, Northern Ireland.
On 3 January 2002 another UDA member died in a premature pipe bomb explosion in Coleraine, Northern Ireland.
On 10 August 2006 four pipe bombs were found in and around the city of Salem, Oregon, United States. Some suspected a "serial pipe bomber" was at fault. A man was later arrested and charged.
On 11 December 2010 a suicide bomber used one out of six pipe bombs close to a major shopping district in Stockholm, Sweden. It killed the man and no one else. The incident is known as the 2010 Stockholm bombings.