Turkish authorities have detained around 40 foreign nationals suspected of having links to the so-called Islamic State.
Police officers launched raids on some 23 addresses in Istanbul late on Sunday, according to reports.
Those detained were said to include nationals from Iran, Iraq, Afghanistan and Azerbaijan.
State-run agency Andadolu said that some of the suspects had travelled to conflict areas in Syria several times.
Turkey has suffered from a wave of suicide attacks blamed on IS over the last year, in which more than 200 people have been killed.
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German special forces have arrested a Syrian refugee on suspicion of plotting an attack inspired by the so-called Islamic State.
The 24-year-old is suspected being member of the terror group and of planning an attack at the start of the Bundesliga season - the equivalent of the Premier League.
The man was arrested in Mutterstadt in the western state of Rhineland-Palatinate.
"There are indications that something is being planned for the start of the Bundesliga season," a interior ministry spokesman for the region told AFP.
However in a separate statement the ministry added there was currently "no evidence of a concrete threat".
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