By Emre Peker And Sam Schechner 

ISTANBUL--A Turkish court Monday banned access to Twitter Inc. and Google Inc.'s YouTube for failing to remove content related to a deadly hostage crisis last week, marking the second time in a year that the social-media platforms have been blocked after getting mired in Turkey's political turmoil.

The blackout came after an Istanbul court ordered the two U.S. companies, as well as Facebook Inc. and dozens of other local and foreign websites, to take down images, voice and videos recordings linked to the hostage crisis, threatening a blanket blockade for noncompliance. By Monday evening, Twitter access was restored as authorities said the microblogging service confirmed it had removed tweets containing the banned material and listed in the court decision, while YouTube remained blocked.

The Ankara-based Internet Service Providers' Association, which represents all operators in Turkey, distributed the court order to its members Monday, said a company representative, who declined to be identified because the person wasn't authorized to speak about legal matters.

Turkish Internet users were reporting blackouts and skirting the ban by using virtual-private networks, or VPNs, that obscure the country of access to allow the use of the social-media platforms.

A Google spokesman said the company is working to restore access to YouTube "as soon as possible."

A Facebook spokesman said Monday that the company had received a "valid court order" in Turkey to "restrict access to certain content or our service would be blocked." The spokesman said Facebook has complied with the order, but is appealing it.

Aside from social-media platforms, the decision also covers websites of leading Turkish outlets Hurriyet and NTV news channel, local opposition newspapers Cumhuriyet and Sozcu, as well as U.K. newspaper the Independent and Australia's top-ranking news website news.com.au, the person familiar with the court order said.

The Istanbul court's decision comes after the Revolutionary People's Liberation Party-Front, or DHKP-C, killed a prosecutor overseeing a high-profile, politically charged case last Tuesday.

During the half-day standoff between two members of the terrorist-listed organization and security forces, the DHKP-C published photos on social-media of Prosecutor Mehmet Selim Kiraz with a gun to his head and the Marxist-Leninist outfit's yellow-starred red flags in the background. The pictures were widely distributed and some newspapers printed them on their cover, prompting a strong backlash from the government and prosecutors.

"It is not acceptable for certain media organizations that must act with the responsibilities of being the press to publish these photos, as if they were engaged in terrorism propaganda," Turkish presidency Spokesman Ibrahim Kalin said Monday, shortly after the bans came into effect. He said "any blocking of access is out of the question" despite the start of blackouts on Twitter and YouTube, adding that he had heard of the developments shortly before his news conference.

The court ordered the removal of Mr. Kiraz's photos and videos, and blocking of related links where content removal wasn't possible. Barring both options, the websites should be banned entirely, the court said.

"These broadcasts have been shared as propaganda for the armed terrorist organization DHKP-C," the decision said, adding that their publication also endangered public safety. Last year's Twitter and YouTube bans were based on national security.

Yeliz Candemir contributed to this article.

Write to Emre Peker at emre.peker@wsj.com and Sam Schechner at sam.schechner@wsj.com

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