"Upon learning of the terrorist propaganda carried out by the PKK supporters in Gothenburg, the [Turkish] Foreign Ministry summoned the charge d'affaires of the Swedish Embassy in Ankara," the source said.
"In this context, [the ministry] expressed expectations that the perpetrators will be identified, the necessary legal and judicial measures, and specific steps will be taken in the light of the commitments set out in the Trilateral Memorandum signed in Madrid."
In mid-May, three months since the onset of the Ukraine crisis, Finland and Sweden submitted their NATO membership applications, abandoning decades of neutrality and citing a shift in the security situation in Europe.
The consideration of the bids was initially blocked by Turkey due to Helsinki and Stockholm's long-standing support of the PKK, which Ankara regards as a terrorist organization and a threat to its national security.
On June 28, prior to the landmark NATO summit in Madrid, Turkey, Sweden and Finland signed a security memorandum that unblocked the beginning of negotiations on the accession of the two Scandinavian countries to the alliance. The parties agreed to strengthen cooperation in the fight against terrorism, including measures against the PKK, and address Ankara's concerns.