According to hazard prevention law, the landowner and the holder of the actual power, also referred to as the party responsible for the condition, or, in the case of construction measures, the building owner, are generally responsible for averting hazards. For factual and legal reasons, the party responsible for bombs dropped or munitions fired cannot be held liable. This follows from the general principles of hazard prevention law.
To support the regulatory authorities, the state of Lower Saxony has set up an explosive ordnance disposal service (Kampfmittelbeseitigungsdienst, Marienstraße 34, 30171 Hanover), which is not itself an emergency response authority but acts by way of administrative assistance.
The KBD uses aerial photographs and contamination maps to check whether explosive ordnance is suspected. The hazard potential is determined on a case-by-case basis. If there is a suspicion, a recommendation is made to the applicant regarding further measures.
If explosive ordnance is suspected, a technical investigation is carried out (e.g. surface sounding). If the suspicion of danger is confirmed, the clearance of the individual areas suspected or contaminated with explosive ordnance or the individual point is planned and initiated. The explosive ordnance is removed by the KBD.
If large unexploded ordnance has to be defused on site, this may result in the surrounding residential areas being evacuated for safety reasons. The size of the area to be evacuated depends on the unexploded ordnance. In the event of such a measure, both the affected persons and other citizens will be informed via radio, the Internet and press releases.