Concerns raised over mysterious packages of white powder sent to addresses in Northamptonshire

They appeared at the Kettering sorting office before arriving at the buildings, which included two banks and a private business.

However, after testing the susbstance, Northamptonshire Police confirmed that it was, in fact, crushed paracetamol.

A police spokesman said: “Extensive tests revealed the substance to be crushed paracetamol, which was harmless.

“We would urge anyone who finds anything suspicious in the post to contact the police in order for properly trained officers to deal safely with any substance.”