The authority has searched the area and has found nothing out of the ordinary.
"We took one of our monitoring cars and drove around the area in question on Wednesday afternoon, collecting data with our regular monitoring equipment," Jonas Wessel, Head of the Spectrum Licensing at PTS told news agency TT.
The reason for the sweep is that the daily Dagens Nyheter reported finding "indications" of spying equipment being placed in the area around Rosenbad. The newspaper said it had found signs of so called IMSI-catchers (International Mobile Subscriber Identity) operating in the area. This is phone eavesdropping devices used for intercepting mobile phone traffic and tracking movement of mobile phone users.
The fact that PTS could not find any proof of "illegal radio submissions" does not necessarily mean that there have not been signals in the past, Wessel said. Given the information gathered by the newspaper, he says it is "not unlikely" that the authority will conduct random spot checks in the future.