ISTANBUL: Turkish police have detained 48 suspected Islamic State members who were preparing to launch an attack, an Istanbul police spokesman and state-run Anadolu news agency said on Saturday.Police raided six addresses in three districts of Istanbul late on Friday, and detained 31 foreign nationals, the police spokesman said in a statement. Seventeen more foreign nationals who were also preparing to launch an attack were detained in raids across the capital Ankara, Anadolu said.