Turkey has ordered the detention of 68 suspects, including dozens of colonels, in an operation targeting alleged supporters of the US-based Islamic cleric whom Ankara accuses of orchestrating an attempted coup two years ago. Nineteen serving officers were among those facing arrest in an operation focused on the military’s land forces across 19 provinces including the capital, Ankara, state-run Anadolu news agency said on Monday. According to sources in the Ankara chief prosecutor’s office, the suspects were found to have been in contact by landline phone with operatives of the preacher Fethullah Gulen, who denies involvement in the failed putsch on July 15, 2016.