When violence hits a city, people flee. But that can make them targets for terrorists to capture or kill.
That's what happened in the northern Iraqi city of Kirkuk in early August. The United Nations says ISIS took as many as 3,000 Iraqis into captivity. At least 12 were killed.
Iraqi Observatory for Human Rights put its estimate of the situation lower, at 1,900 people captured.
While an increase in international efforts to retake cities might be good for the fight against terrorism overall, it's a lose-lose situation for civilians.
And all over Syria, fleeing a besieged city might be the only way to get aid like food — but that can be a deadly decision.
Of course, ISIS isn't the only terrorist group to capture vulnerable civilians.
Almost 10 million people in Iraq and Syria are currently displaced, and millions more are in need of aid.