The present invention relates to methods, nodes, arrangements and articles of manufacture to automatically identify unknown identities of a target. The method comprises the following steps: positioning indicators indicating presence of a known identity of the target in at least one location are periodically collected; —at least one mobile network is interrogated and lists of identities of users located in defined target areas, each area covering at least one of the collected positioning indicators, are fetched; —a crosscheck between the fetched lists is performed; a single or restricted number of identities that is common to the fetched lists is identified.