By Emre Peker 

ISTANBUL--Turkish authorities briefly cut off access to Twitter Inc. on Wednesday to block the spread of information about a suicide bombing that has convulsed the country and to prevent unauthorized demonstrations.

The Twitter blackout came just hours after a court in the southern province of Sanliurfa ordered the suppression of images and videos on Monday's suicide bombing in Suruç, which killed at least 32 people and wounded more than 100 others. Turkish officials have blamed the attack on the Sunni Muslim extremist group Islamic State

Adding to tensions in Turkey, the Kurdistan Workers' Party, or PKK, claimed responsibility for the killings on Wednesday of a police officer and a member of a government counterterrorism unit in the province of Sanliurfa, which encompasses Suruç. The group said the killings were retaliation for the Suruç bombing and for what it said was the cooperation by the two men with Islamic State.

An official in Sanliurfa had no immediate comment on the claim. The PKK, which has been fighting has been fighting for autonomy in southeastern Turkey since 1984, is designated a terrorist organization by Ankara, Washington and the European Union.

In a statement about the social-media ban, Turkey's state-run Anadolu news agency said it was imposed because of the dissemination of information about the Monday's suicide attack and calls for what the agency described as "illegal mass demonstrations."

Turkey's Internet Service Providers Association delivered court orders to Twitter, Facebook Inc. and Google Inc.'s video-sharing website, YouTube, demanding the removal of attack-related content, Anadolu said.

While Facebook and YouTube quickly removed the banned content and kept operating, Twitter shut down briefly to give it more time to comply with the court order.

A spokesman for Twitter had no immediate comment.

In the past two years, the government has stepped up its efforts to control Twitter, Facebook and Google, with the companies in many cases complying with demands by authorities to remove content.

In April, a Turkish court temporarily blocked user access to Twitter and YouTube for failing to remove content related to a hostage crisis. Facebook was also hit with a brief interruption. All the sites went back online within hours after complying with the order.

Monday's attack near Turkey's border with Syria has been condemned across the country. It has also sparked criticism of Ankara's efforts to unseat Syrian President Bashar al- Assad, which some critics say has drawn Islamist militant groups closer to Turkey's border, if not into the country itself.

Opposition lawmakers have called for mass protests to condemn terrorism and the government's foreign policy, while police have deployed tear-gas and water cannons against demonstrating government opponents.

Sam Schechner in Paris contributed to this article.

Write to Emre Peker at emre.peker@wsj.com

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