When I was a visiting professor on Turkey (1998 - 1999), I would take a walk every day after the end of classes. One day, on my usual route, I passed a building on fire, with several fire trucks, lots of police, etc., trying to put the fire out and control the crowd and traffic. It turned out that the fire was set by the PKK. The building was a typical "vertical mall," common in Istanbul. The terrorists had carried cans of gasoline to the top floor, poured the gasoline down the steps, and lit it off (I presume they went down the stairs before setting the fire). To make the situation even worse, the building violated the Turkish building code. It was over 10 stories high, but did not have the external fire escapes that the code required. Result: lots of lives lost that needn't have been.
To my amazement, the Turkish police eventually caught the terrorists who had set the fire. I remember reading about the trial, but don't recall the sentences.