Police have found explosives, detonators and a gun in a cinema in Russia's second city St Petersburg which was closed for renovation, the Interior Ministry said on Thursday. Interfax news agency quoted a ministry spokesman as saying the stash included 900 grams (two pounds) of plastic explosives, a 200-gram (half-pound) stick of dynamite, two improvised explosive devices, a hunting rifle and 23 rounds. Interfax news agency said the St Petersburg arrests had been made by organized crime squad detectives, suggesting the find might have been linked to criminal gangs.