A police officer stands as security officials close the main roads around an explosion site in Ankara, Turkey, Wednesday, Feb. 17, 2016.

Turkey is to tighten security across the country, and especially the capital, following a car bombing that killed 28 people in Ankara this week, Prime Minister Ahmet Davutoglu said on Saturday.

Davutoglu also said, in a briefing to reporters broadcast live on television, that the Turkish Kurdish militant group TAK had claimed the attack as a “proxy” to shield the Syrian Kurdish YPG militia.

He urged Turkey’s NATO ally Washington to see any attack on Turkey as an attack on the United States.

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