The "police authority has not had sufficient support for its decisions," judge Eva-Lotta Hedin said in a statement, referring to planned protests outside the Turkish and Iraqi embassies in Stockholm.

Swedish intelligence announced the arrest of five people suspected of planning a "terrorist act" after demonstrators burnt the Koran in front of the Turkish embassy in Stockholm in January.

"The current case is one of several that the Swedish Security Service has been working on... in connection with the high-profile Koran burning," said Susanna Trehorning, deputy head of the security service's counterterrorism unit, adding that suspects were linked to international "Islamic extremism".