Tillerson says ex-spy poisoning has Russia link

US Secretary of State Rex Tillerson says the harming of ex-spy Sergei Skripal in Britain "unmistakably originated from Russia" and "absolutely will trigger a reaction." 

Tillerson says he doesn't know whether Russia's legislature known about the harming. However, he is contending the toxic substance couldn't have begun anyplace else. 

He says the substance is known to the US and doesn't exist generally. He says it's "just in the hands of an, exceptionally set number of gatherings." 

Tillerson calls the harming "an extremely appalling act" and says it's "nearly incomprehensible" that a state on-screen character would utilize such an unsafe substance in an open place. 

In any case, he says he won't expand on what reaction may take after. 

Tillerson addressed columnists on his flying machine as he flew from Nigeria to Washington.