Police revealed on Monday that they found a number of ‘suspicious items’ at a house on Shakespeare Street.
An Army bomb squad attended and a number of nearby properties were evacuated for several hours.
A man was subsequently arrested on suspicion of making or preparing explosives with intent.
On Thursday morning, a Derbyshire Constabulary spokesperson said: “The man remains released on bail.
“The man is in his 60s and it is not being treated as terrorism-related at this time.”