Van Doorn was arrested on Sunday after officers of the Royal and Diplomatic Protection Service, who ensure Rutte's security, spotted the municipal official in the district where the acting prime minister was at that time. Van Doorn reportedly acted suspiciously.
The city council member was released on Monday after questioning, the newspaper reported, adding that the probe will continue.
De Telegraaf newspaper reported on Monday, citing informed sources, that the acting prime minister was given extra personal protection after the so-called spotters — people hired by criminal organizations to prepare the ground for an attack or abduction — supposedly affiliated with the Moroccan mafia were seen around Rutte.