UK prime minister says it's 'highly likely' Russia responsible for poisoning of ex-spy Sergei Skripal

Theresa May: “This attempted murder using a weapons-grade nerve agent in a British town was not just a crime against the Skripals, it was an indiscriminate and reckless act against the United Kingdom, putting the lives of innocent civilians at risk. We will not tolerate such a brazen attempt to murder innocent civilians on our soil.”
The type of agent was named by the researchers at Porton Down, also in Wiltshire.
Russia has been able to make these types of agents in the past, and could still do so, meaning they must have been in some part, behind this attack.
She added that we must be lead by evidence, not speculation and that is why the police have been given time and space to look at the crime scenes.
She says the investigation continues and police and army must be able to keep doing their work.
The National Security Council met this morning, she said. 

Theresa May says we must be ready to take "more extensive measures"
“We must now stand ready to take much more extensive measures. On Wednesday, we will consider in detail the response from the Russian state. Should there be no credible response, we will conclude that this action amounts to an unlawful use of force by the Russian state against the United Kingdom, and I will come back to this House and set out the full range of measures we will take in response.”

Russia is "highly likely" to be responsible for what happened, she tells MPs.