Turkish authorities issued detention warrants for 99 suspects including doctors and lawyers and have so far detained 78 of them, Anadolu news agency said on Thursday. The move is part of a widening crackdown since last year's failed coup attempt. The suspects were believed to be users of ByLock, an encrypted messaging app which the government says was used by the network of US-based cleric Fethullah Gulen, Reuters said. The cleric denies involvement in July 2016’s abortive putsch.