Anadolu Agency says the suspects, including foreign nationals, were detained in simultaneous raids early Friday. Anadolu says police had warrants to detain 17 other suspects.
The agency says one of the suspects jumped out of a balcony to try and avoid arrest but was soon caught.
Turkey has suffered a series of deadly attacks blamed on IS militants, including a New Year's attack at an Istanbul nightclub by a gunman that killed 39 people.
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