Black boxes provide no clues in double crash riddle

Flight recorders from the wreckage of two planes that crashed almost simultaneously in Russia have not revealed reliable information on the causes of the double disaster, a top Russian official said.

Vladimir Yakovlev, the Russian president’s envoy for the southern region, where one of the planes crashed, said that the main theory about the catastrophe “remains terrorism", the ITAR-Tass news agency said.