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Personnel in protective coveralls and breathing equiptment cover an ambulance with a tarpaulin at the Salisbury District Hospital in Salisbury, southern England, on March 10, 2018, in connection with the major incident sparked after a man and a woman were apparently poisoned in a nerve agent attack.
British soldiers were deployed on March 9 to help a counter-terrorism investigation into a nerve agent attack on former Russian spy Sergei Skripal, as speculation mounted over how London could retaliate if the Russian state is found to be responsible. Skripal and his daughter Yulia remain unconscious in a critical but stable condition following the March 4 attack in the sleepy south-western English city of Salisbury. The Counter Terrorism Policing Network requested assistance from the military to remove a number of vehicles and objects from Salisbury.   / AFP PHOTO / Daniel LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Personnel in protective coveralls and breathing equiptment cover an ambulance with a tarpaulin at the Salisbury District Hospital in Salisbury, southern England, on March 10, 2018, in connection with the major incident sparked after a man and a woman were apparently poisoned in a nerve agent attack.
British soldiers were deployed on March 9 to help a counter-terrorism investigation into a nerve agent attack on former Russian spy Sergei Skripal, as speculation mounted over how London could retaliate if the Russian state is found to be responsible. Skripal and his daughter Yulia remain unconscious in a critical but stable condition following the March 4 attack in the sleepy south-western English city of Salisbury. The Counter Terrorism Policing Network requested assistance from the military to remove a number of vehicles and objects from Salisbury.   / AFP PHOTO / Daniel LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

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    Nerve agent attack still a mystery one month on

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Nerve agent attack still a mystery one month on

CNN's Phil Black lays out the developments in the month since former Russian spy Sergei Skripal was attacked with a nerve agent in Salisbury, England.

Nerve agent attack still a mystery one month on

CNN's Phil Black lays out the developments in the month since former Russian spy Sergei Skripal was attacked with a nerve agent in Salisbury, England.