Tony Martin, the Norfolk farmer jailed for shooting dead a teenage burglar, has been arrested for possession of an illegal firearm, sources said.
Martin, 71, served three years in prison for shooting dead Fred Barras, 16, at his home in Emneth Hungate, Norfolk, in 1999. He was initially found guilty of murder but this was reduced to manslaughter on appeal.
A Norfolk Police spokesman said: "As part of a planned operation, a 71-year-old man has been arrested in Wisbech this morning on suspicion of possession of an illegal firearm. He remains in police custody.
"A police search of a property in Emneth Hungate is currently being undertaken."