Turkish police detained 101 ISIS suspects in a vast anti-terror operation in the capital Ankara, state media reported on Thursday.
A total of 1,500 police officers took part in the raids across the Turkish capital after authorities issued arrest warrants for 245 suspects, state-run news agency Anadolu said.
The raids took place at 250 addresses where documents and digital material were found, the agency said, without giving further details.
According to Anadolu, authorities have detention warrants for 144 other ISIS suspects.
The agency said some of the suspects were members of a local group that allegedly "sponsored" ISIS.
Last month dozens of suspects from the group were detained across the country including 49 alleged members of ISIS in Ankara, some of whom were suspected of planning an attack.
Turkey has been hit by a series of attacks blamed on the terrorist group in the past two years, including one on an elite Istanbul nightclub at the New Year during which 39 people were killed by an ISIS gunman.
Although there has been a lull in attacks since January, Turkish police have conducted raids almost daily against ISIS cells across the country.