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Hello and welcome to NewsHour.
It's coming to you live from the BBC World Service Studios in central London.
Hi, I'm Tim Franks.
We're beginning with a street scene in Moscow.
It's still dark.
An unremarkable apartment block has had its entranceway blown out.
On the pavement, on the blood stained snow lie two bodies.
They're Lieutenant General Igor Kirilov and his assistant.
Kirilov was the head of Russia's Radiation, Biological and Chemical Protection Unit.
He'd been accused by the west of overseeing the use of chemical weapons in Ukraine.
And short.
Shortly after the deaths were announced, Ukrainian officials briefed off the record that it was their secret service which planted the bomb.
Yulia is a Muscovite who lives nearby.
The explosion was so powerful, I was terribly afraid to look out the window.
People started coming out of this house to see what happened.
Thankfully my building wasn't damaged, but it's very scary.