Two teenagers and an older man will face court charged over an alleged murder conspiracy.
The trio were arrested over the weekend and electronic equipment was seized.
South Australian police have reassured the community that their safety was not at risk and the alleged threats were not random.
Officers arrested a 17-year-old boy at a house in Huntfield Heights on Friday where they also seized a knife.
He has been charged with conspire to murder, possess object with intent to kill or endanger life, possess prohibited weapon and assault.
He was refused bail and will appear in Adelaide Youth Court on Monday.
Police arrested a 15-year-old boy from a residence in Park Holme on Saturday.
He was charged with conspire to murder, refused bail and will also appear in Adelaide Youth Court on Monday.
A 20-year-old man was arrested in Kilburn on Saturday and charged with conspire to murder.
He was refused bail and will appear in the Christies Beach Magistrates Court on Monday.
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