London, Great Britain—The British Government has identified two Russian nationals as the main suspects for the poisoning of a former Russian spy and his daughter.

The Scotland Yard and the Crown Prosecution Service (CPS) has named Alexander Petrov and Ruslan Boshirov as the main perpetrators. They are believed to be working for the Russian military intelligence service, GRU, under aliases.

Last March, Sergei Skripal and his daughter Yulia Skripal were poisoned with the nerve agent Novichok. A British law enforcement officer, Detective Sergeant Nick Bailey, was also contaminated whilst responding to the attack. The GRU agents sprayed Skripal’s house door in Salisbury with a perfume bottle containing the Novichok agent.

Two British citizens were also poisoned by Novichok. Dawn Sturgess and Charlie Rowley found the perfume bottle in question in a charity box. Trying to open it, they became contaminated. Unfortunately, Sturgess died in the hospital; Rowley was discharged earlier this summer.