Members of the military, following the poisoning of Sergei Skripal and his daughter in April | Matt Cardy/Getty Images UK police identify suspects behind Skripal poisoning: report Police ‘sure’ that suspects identified through CCTV are Russian.

British police have identified several Russians as suspects in the nerve agent attack on former Russian spy Sergei Skripal and his daughter Yulia in Salisbury, according to the U.K.'s Press Association.

"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," the Press Association quotes a source as saying. "[The investigators] are sure [the suspects] are Russian.”

Skripal and his daughter were poisoned in their hometown of Salisbury in March. British authorities identified the chemical used in the attack as Novichok, a Russian-made nerve agent.

The poisoning set off a diplomatic spat between the U.K. and Russia, which the British government blames for the attack. Russia has repeatedly denied any involvement.

Police are also expected to open an inquest on Thursday into the death of 44-year old Dawn Sturgess, who came in contact with Novichok in the town of Amesbury, only 10 miles from Salisbury, earlier this month. Her partner, also contaminated, remains in hospital in critical condition.

Sturgess was exposed to at least 10 times the amount of Novichok the Skripals were exposed to, the Press Association reported. Authorities believe Sturgess and her partner were contaminated via a discarded perfume bottle the couple found in a park or in Salisbury's city center.