A method for determining a threat against a border from objects crossing or trying to cross said border. Said method includes at least the steps of segmenting the border into border elements of uniform terrain features, infrastructure and weather conditions, collecting data of incidents occurring along a given border element, determining a threat potential for said border element, determining a protection factor for the border element, and determining a threat against the border element from the threat potential and protection factor. The method may be used for warning about an increased threat to a border, wherein the threat is compared with a threat value threshold. If the threat exceeds the threat value threshold, an alarm is issued. The method may also be used for allocating protective measures along a border.