Police are currently in attendance at an address on Foxroyd Lane, Dewsbury.
Officers searching the property found a small number of potentially suspicious packages, police confirmed.
The Army’s Explosive Ordnance Disposal Team have been called to attend to examine the packages and to ensure a safe removal.
A police cordon is in place and a number of houses close to the home have been evacuated as a precautionary measure.
Enquiries remain ongoing, police confirmed.
Chief Inspector James Troisi of Kirklees Police said: “I appreciate that there may be concern in the community about this, but we have a number of local officers in the area and it is absolutely standard procedure to evacuate nearby properties in such situations as a precaution.
“Anyone with information that may assist with enquiries is asked to contact 101 quoting log 776 of 10/11.”