Quotes from the news wire:
This latest horrendous turn of events has only served to strengthen the resolve of our investigation team as we work to identify those responsible for this outrageous, reckless and barbaric act, they are unable to say at this moment whether or not the nerve agent found in this incident is linked to the attack on Sergei and Yulia Skripal.
I don't have any intelligence or evidence that they were targeted in any way. There is nothing in their background to suggest that at all, we are not in a position to say whether the nerve agent was from the same batch that the Skripals were exposed to. The possibility that these two investigations might be linked is clearly a line of inquiry for us.
This will look similar to some of the activity that took place in Salisbury earlier this year, again, this is a precautionary, but necessary measure that allows officers to safely carry out meticulous and systematic searches for evidence to support the investigation. This must be done with great care, as you will appreciate, to ensure there is no outstanding risk to both those brave officers and the public.