No official explanations of what caused the catastrophe of the Russian Tu-154M airliner above the Black sea have so far been produced. This was said by chief of the Russian commission of inquiry Vladimir Rushailo, secretary of the Russian Security Council, at the first press conference since the start of work of the state commission. "Every, even the most impossible, version is being considered," he said. But he refused to cite even working hypotheses. For example, only experts in ballistics can pass a decision on what produced holes discovered in recovered fragments of the door of the pilot cabin, said Rushailo. The radius of fall of the plane's fragments is 10 kilometers, he continued. The ten vessels, one aircraft, two helicopters and 120 rescuers doing work on the site of crash are trying to find "the maximum of what can be found on the surface", Rushailo stressed.