A auto bomb killed eight people and wounded more than 100 in southeastern Turkey's largest city on Friday, Prime Minister Binali Yildirim said, hours after police detained the leaders of the mostly Kurdish region's biggest political party. Justice Minister Bekir Bozdag said both police and civilians were killed but did not say how many.
The European Union has warned Turkey to respect democratic norms in the fight against the outlawed Kurdistan Workers' Party (PKK), while EU member state ambassadors to Ankara discussed possible outcomes of a further deterioration of ties between Brussels and Turkey over the detention of several Peoples' Democratic Party (HDP) deputies. The cause of the explosion was not immediately known but Hurriyet newspaper said it may have been caused by a vehicle bomb.
The HDP is the third largest party in the 550-seat Turkish parliament with 59 seats and the main political representative of the Kurdish minority.
The detentions - on a range of "terrorism"-related charges - come on the heels of mass closures of Kurdish media outlets, the ousting of at least 24 pro-Kurdish mayors and rolling blackouts on internet access that hinder communications".
Police also raided and searched the party's head office in central Ankara.
Ankara has been accused of cracking down on dissidents since a coup attempt over the summer.
Friday's overnight detentions included People's Democratic Party co-chairs Selahattin Demirtas and Figen Yuksekdag. Among the 12 lawmakers, seven were remanded in custody, three released under judicial control while two others are still being questioned.
The detentions occurred in the middle of the night, with Mr Demirtas describing on Twitter how he was taken into custody: "Police officials are at the door to my house in Diyarbakir with a detention warrant".
Access was restricted to social media including Twitter, WhatsApp, YouTube and Facebook - making them so slow they were effectively impossible to use - and a ban imposed on media coverage of the auto bomb.
Was access blocked to social media?
Four civilian buildings were heavily damaged in the blast
What has the HDP said?
Branch chief Dogan Erbas also called for a larger protest to take place on Saturday afternoon.
Since the 1980s, Turkey has faced a prolonged, often brutal insurgency sustained by the refusal to allow the democratic expression of Kurdish grievances. "As a friend and ally, [we are] deeply troubled that the government of Turkey has detained HDP leaders and other MPs while blocking internet access".
The party says the detentions risk triggering a civil war.
She added: "We will use our legitimate right of resistance".
"Coming after the blanket closure by executive decree of Turkey's Kurdish media and the arrests of Diyarbakır's co-mayors, it gravely undermines the rights to freedom of expression and association and severely restricts the ability to participate in public life". Kisanak, a member of HDP, was detained on terror-related charges, according to Anadolu.
Since the arrests, protesters demonstrating against the detentions have been met with tear gas and water cannons in the cities of Istanbul, Ankara, Izmir and Antalya.
The EU and many of its 28 member states have also warned Turkey that any re-introduction of the death penalty would immediately scupper its already very hard EU membership talks. For much of the 20th century, the state oppressed this community.
Turkish authorities on Friday detained 12 pro-Kurdish members of Parliament for questioning in terror-related probes, drawing sharp concern from the United States and the European Union, who feared the move hurts Turkey's democracy. "This attack is no different then any attack on Kurdish officials in the last 100 years".