a recent interview with the w. news. british foreign secretary boris johnson said there was no doubt in his mind that russia is to blame you argue that their source of north edge and choke is russia how did you manage to find that out so quickly that was driven by says samples of the case when i look at the evidence we the people from from porton down the. they have the samples you do and they they they were absolutely categorical and i asked the guy why so i said are you sure and he said as they don't. there you have it the foreign office is no contradiction between those statements we just heard and the latest results from british chemical weapons experts well the lab task whether down to fighting the nerve agent used in the attack and stopped short of saying it could identify where the poison came from this is porton down the lab in britain at the center of the investigation into the