In the Turkish capital Ankara, a car bomb attack has killed 37 people, marking the second such attack in the capital in less than a month. No one has taken responsibility for the bombing, but unnamed officials alleged one of the bombers was a female member of the Kurdistan Workers’ Party, or PKK. Turkey has vowed a crackdown, launching airstrikes targeting Kurdish rebels in northern Iraq, imposing curfews in majority-Kurdish towns and arresting at least 36 people.