Former Russian spy Sergei Skripal, 66, and his daughter Yulia, 33, were found collapsed after being poisoned last week. Both remain in a serious condition along with a police officer who came in contact with the same substance.
British Prime Minister Theresa May yesterday said it was "highly likely" that Russia was behind the nerve agent attack on Skripal who was once an informant for Britain's foreign intelligence service. Russia has denied the allegation.
"We have full confidence in the UK's investigation and its assessment that Russia was likely responsible for the nerve agent attack that took place in Salisbury last week," he said in a statement.
Tillerson said there was never a justification for such an attack - the attempted murder of a private citizen on the soil of a sovereign nation - and "the US is outraged that Russia appears to have again engaged in such behaviour".
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"From Ukraine to Syria - and now the UK - Russia continues to be, acting with open disregard for the sovereignty of other states and the life of their citizens," he alleged.
The White House condemned the chemical attack as "an outrage".
"We are standing with our UK ally," White House Press Secretary Sarah Sanders told reporters.
Sanders said the US has been monitoring the incident closely and takes it very seriously.
"The use of a highly lethal nerve agent against UK citizens on UK soil is an outrage," she said.
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