Turkish authorities stated on Saturday that 15 people with connections to IS had been arrested on suspicion of planning crimes against, among other things, the Swedish and Dutch consulates.
Christian and Jewish religious targets would also be attacked, according to the plans revealed by the Turkish police's anti-terrorist unit, according to Turkish newspaper Hürriyet.
Ministry of Foreign Affairs: Acknowledged the data
But the police have not had time to indicate any "concrete threats" against those targets, Istanbul's police chief said in a written statement on Sunday.
The Swedish Ministry of Foreign Affairs said on Saturday that they have taken note of the information and that they are in contact with the embassies in Turkey.
- We are following up on the information, but have no further comments at the moment, said Ellen Sundberg at the Foreign Ministry's press service.
Earlier this week, several countries, including the US and Sweden, closed their embassies in Istanbul due to an increased terrorist threat after several Koran burnings in Europe.
The decisions angered the Turkish government and recalled nine ambassadors to the Ministry of Foreign Affairs.
This when they saw the closure as part of a "new psychological war" against Turkey.
Correspondent: "Remarkable"
Tomas Thorén, SVT's Turkey correspondent, sees this weekend's arrests as a Turkish backlash in the embassy's history.
- Through these arrests, Turkey presents itself as proactive and able to take action.
When they summoned the ambassadors, the interior minister accused them of smearing Turkey and scaring away tourists.
This is Turkey's response to that situation, he says.
According to Tomas Thorén, it is not unusual for Turkish police to arrest several suspected IS terrorists at the same time.
But the fact that there are now different offers about what they are actually accused of makes the case stand out.
- It is surprising because they themselves say that there is no evidence of planned terror.
But in front of the home crowd, this sends the signal: "We're on it, we've got a handle on it, people," he says.