Police have arrested a 68-year-old man on suspicion of harassment in connection with an inquiry into the sending of animal-themed greetings cards to a woman.
A woman in her forties contacted police in January 2016 about cards she had been receiving from a person called 'Gordon'.
Earlier this week, police launched a public appeal for information saying the cards have been sent over six years and have become more graphic and threatening in nature.
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It was believed the cards had been sent from somewhere within the Bristol postmark area.
An Avon and Somerset Police spokesman: "We've arrested a 68-year-old man in connection with our investigation into a harassment inquiry.
"The man, from east Somerset, was arrested yesterday on suspicion of harassment. The arrest relates to greeting cards containing threats sent to a woman in the Bristol area.
"The man was interviewed and released under investigation while our inquiries continue."