By Agence France-Presse LONDON — British media says traces of the nerve agent used to attack a Russian ex-spy and his daughter have been found in Salisbury where the two were poisoned. Investigators in protective clothing prepare to move an ambulance at the South Western Ambulance Service station in Harnham, near Salisbury, England, as police and members of the armed forces probe the suspected nerve agent attack on Russian spy double agent Sergei Skripal, Saturday March 10, 2018. Counter-terrorism police asked for military assistance to remove vehicles and objects from the scene in the city, much of which has been cordoned off over contamination fears of the nerve agent poisoning of former spy Sergei Skripal and his daughter. (Andrew Matthews/PA via AP) BBC and Sky News said Sunday that traces have been detected. BBC said its sources say traces were found at the Zizzi restaurant where Sergei Skripal and his daughter Yulia reportedly ate before falling critically ill. Sky says traces were found in several locations. U.K. officials haven't publicly confirmed that any trace of the nerve agent has been found and say the risk to the public remains low. Officials haven't said what type of nerve agent was used. A large-scale police investigation is underway in Salisbury as forensics experts wearing protective gear search for clues.