A car bomb tore through a crowded transport hub in Ankara on Sunday, killing at least 37 people and wounding 125 others, in the second such attack in the area in less than a month.
NATO member Turkey is currently facing multiple security threats. As part of a U.S.-led coalition, it is fighting Islamic State in neighboring Syria and Iraq. It is also battling PKK militants in its southeast, where a ceasefire collapsed last July, triggering the worst violence since the 1990s.
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