But a CNN investigation in Luhansk has found clear evidence that whatever detonations hit the building and the adjoining park came from the air. The tops of trees were splintered, and a series of small craters -- about a dozen -- had been blasted in a straight line, starting in the park and reaching the walls of the building, blowing out many of its windows and spraying the area with jagged shrapnel. That's what appears to have killed most of the victims and injured 20 more.