Police detained at least 29 Peoples’ Democratic Party (HDP) delegates on Friday in advance of the pro-Kurdish party’s congress, including the entire delegation from one province near Istanbul, left-wing news site Sendika.org said.

The 21 members from Kocaeli were detained on Friday morning, leaving their attendance at the congress in Ankara in question.

In addition, Onur Hamzaoğlu, the co-spokesperson for the HDP umbrella organisation Peoples’ Democratic Congress (HDK) and the HDK-affiliated Revolutionary Party Chairman Musa Piroğlu; Socialist Re-establishment Party (SYKP) Co-Chair Ahmet Kaya; Green and Left Future Party (YSGP) Co-Chairs Naci Sönmez and Eylem Tunceli; Socialist Party of the Oppressed Deputy Chair Fadime Çelebi; and the Socialist Solidarity Party spokeswoman Kezban Konukçu were also detained.

The HDK’s other co-spokesperson, Gülistan Koçyiğit, was among 12 arrested in a second HDP-focused police operation on Friday, Sendika.org said.