Turkish police detained at least 15 protesters in Istanbul on Sunday for participating at a banned LGBT Pride rally, after searching the streets having arrived at the scene after participants had dispersed, according to witnesses. Police declined to comment. The Istanbul Governor’s Office said earlier on Sunday that the Pride March would not be permitted. Turkish police blocked central Istanbul to prevent the march from taking place, shutting down metro stations and blocking traffic on the main streets. President Tayyip Erdogan’s Islamic-rooted AK Party has toughened its rhetoric against the L…