Russian experts have determined that it was the Syrian rebels who on March 19 fired a missile filled with sarin at the suburbs of the town of Aleppo. The Russian documents differ from the US data on the same problem by a very important factor. The USA received its samples via intermediaries. The Russian tests were made right on the site where the ammunition exploded. The samples were tested in Russian laboratories, which are certified by the Organization for the Prohibition of Chemical Weapons (OPCW).