An explosion shook the central sq. of the port metropolis of Taganrog in southwest Russia, near the border with Ukraine on Friday, the RIA information company reported. At least six folks have been injured by the blast, which broken a residential constructing, in response to one other company, Tass. Videos from the scene circulated on-line confirmed a crater within the floor and a low-rise constructing partly decreased to rubble. The reason behind the blast was not instantly identified