Thousands of protestors march and hold a banner reading 'Islamic state will lose, our people will win' on Istiklal Avenue in Istanbul during a demonstration on July 20,2015, following an explosion in Turkey's southern town of Suruc. A suspected Islamic State suicide bomber killed at least 31 people in an attack on a Turkish cultural centre where activists had gathered to prepare for an aid mission in the nearby Syrian town of Kobane. AFP PHOTO / OZAN KOSE (Photo credit should read OZAN KOSE/AFP/Getty Images)

Thousands of protestors march and hold a banner reading 'Islamic state will lose, our people will win' on Istiklal Avenue in Istanbul during a demonstration on July 20,2015, following an explosion in Turkey's southern town of Suruc. A suspected Islamic State suicide bomber killed at least 31 people in an attack on a Turkish cultural centre where activists had gathered to prepare for an aid mission in the nearby Syrian town of Kobane. AFP PHOTO / OZAN KOSE        (Photo credit should read OZAN KOSE/AFP/Getty Images)