The Police were called at around 11.30am on Wednesday 12 September following concerns for the welfare of a woman in Bideford.
Initial enquiries led officers to attend an address in Bridge Street, Bideford.
Whilst at the address, some of our officer complained of feeling unwell and were immediately removed from the scene and a cordon put in place.
The ambulance Hazardous Area Response Team (HART) attended and treated these officers, all of whom are unharmed and have since returned to duty.
Following searches within the property, a number of items were found which require expert analysis from specialist officers and an Explosive Ordnance Disposal (EOD) team. Police have also been supported by fire and ambulance at the scene.
The house has been evacuated and enquiries are ongoing at the property.
Officers have sought specialist advice and it has not been deemed necessary to evacuate any other properties; there is not believed to be any wider public risk at this time.
A 73-year-old local man has been detained under the explosives act and awaits questioning.