Death on UK soil 'will not go unpunished

London (CNN)The British government was set to hold an emergency top-level meeting Wednesday to discuss the apparent poisoning of a former Russian spy, as the country's top diplomat warned that the UK would respond "robustly" if the Kremlin was found to be involved.

UK Home Secretary Amber Rudd will chair the cabinet-level COBRA meeting to discuss the investigation into the case of Sergei Skripal -- a former Russian military official convicted of spying for the UK -- and his daughter, who were found unconscious on a bench in southern England on Sunday.
Due to the "unusual circumstances" of the case, London's Metropolitan police said its counter-terrorism unit had taken over the investigation from local police.
The high-level meeting comes after UK Foreign Secretary Boris Johnson said Tuesday that while he is not "pointing fingers, as we cannot," Britain would make it clear to governments "around the world that no attempts to take innocent lives on UK soil will go unpunished."