Prosecutors have requested an arrest warrant for 21 police officers detained under the scope of the unlawful wiretapping investigation initiated in Istanbul and launched in 12 cities.The officers were referred by prosecutors to Istanbul Criminal Court of Peace with a request for an arrest warrant on Thursday.They are expected to be interrogated by the judges.21 police officers accused of being affiliated with the Gülen Movement and wiretapping top state officials, including President Recep Tayyip Erdoğan, were detained earlier this week as part of the investigation, led by the Public Prosecutor of Istanbul.Some of the charges that the police officers face include espionage for political and military purposes by a terrorist organization, and threatening the national security of the Turkish Republic. Top level state meetings were also allegedly wiretapped and released on social media, raising fears about the degree of the threat posed by the infiltrators.It was reported that the operation was initiated under the scope of the Tawhid-Salam case, which was controversially attributed to a terrorist organization in the 1990s and was reused by agents of the Gülen Movement to fabricate evidence for unlawful spying purposes. Hundreds of people from different social, economic, political and ideological backgrounds were wiretapped for allegedly being members of a terrorist organization. The case was dismissed when the prosecutor's office ruled there was a "lack of grounds for legal action" against the alleged members of the so-called Tawhid-Salam organization.