Kurdish groups have denied their involvement in the attack in Istanbul, Turkey’s largest city, which killed at least six people and injured scores of others on Sunday. Senior Turkish officials pointed fingers at the Turkish-Kurdish militia Kurdistan Workers’ Party (PKK) and the Syrian-Kurdish People’s Protection Units (YPG) for perpetrating the attack, according to Turkey’s Anadolu agency. The outlawed PKK have denied being behind the attack. “Our people and the democratic public know closely that we are not related to this incident, that we will not directly target civilians and that we do no…