British police examining CCTV footage have reportedly identified multiple Russian suspects believed to have carried out the March nerve-agent attack on former spy Sergei Skripal and his daughter.The Skripals were found slumped on a bench at a shopping center in Salisbury, in southern England, on March 4. Subsequent investigation indicated they were poisoned by a nerve agent of the type Novichok, a group of deadly chemicals developed in the Soviet Union in the 1970s and 80s.Britain's Press Association, citing a source close to the investigation, reports, "Investigators believe they have identified the suspected perpetrators of the novichok attack through CCTV and have cross-checked this with records of people who entered the country around that time. They (the investigators) are sure they (the suspects) are Russian."Sergei Skripal was a double agent during the 1990s and early 2000s but was arrested in Russia in 2006. He reportedly passed secrets to British intelligence even as he worked for the GRU, Russia's military intelligence branch. Following a high-profile prisoner swap with Russia, Skripal came to the U.K.Yulia was released from a Salisbury hospital in April, followed by her father about a month later. The U.K. has blamed Russia for the attack, a charge that the Kremlin has strongly denied. Instead, Moscow has suggested that the poisonings are a British-led attempt to discredit Russia.Meanwhile, an inquest begins Thursday into the death of 44-year-old Dawn Sturgess, who was also poisoned with Novichok last month, along with her partner Charlie Rowley, not far from where the Skripals were found. Sturgess died earlier this month and Rowley reportedly remains in critical condition.The PA reports that investigators believe Sturgess was exposed to 10 times the amount of Novichok as the Skripals.According to The Guardian newspaper: