Midnight drilling and neighborly mobs

The other night soon after Ev and I had gone to bed, a high-decibel vrrrrrrrrrrroooooom vrrrreeeeeeeeeee jolted us upright. The noise paused and then abruptly continued several seconds later. This scenario repeated until Evren hopped out of bed, threw on some pants and headed out the door and up the stairs to find the culprit of the midnight drilling. The driller turned out to be a man who was working on the flat 2 floors above us. However, when Evren got to the door and knocked the man refused to answer. Ev then went downstairs where he found a group of neighbors who were similarly annoyed by the night noises. He found the night guard and then the whole neighborly mob headed back for the penthouse flat. When they reached the 11th floor, they found the man trying to hastily escape their wrath by running toward the stairwell. The guard caught up with him and lectured him on proper working hours. Everyone dispersed, thinking that this had solved the problem. But no -- the following night right around the same time -- vrrrrrrrrrrrrrrooooooming and vreeeeeeeeeeeeeeeing noises resumed once again. This time, our next door neighbor came to our door because the sound was so loud she thought it was coming from us. We assured her that it was not and Ev ran up the stairs once again to confront the man. Other neighbors had already gathered this time. When the guilty driller finally answered the door, certain men lunged at him and had to be restrained. I suppose no one takes lightly to having their sleep so abruptly and rudely disturbed. We went for a few nights with wonderful quiet. But then, the sounds resumed. It turned out that this time, the sounds were coming from the opposite apartment and a different man. I'm hoping this is not a sign of things to come from our top floor neighbors. I don't enjoy noise wars, though I've had to engage in them in the past. . .