Russian intelligence foiled a terror attack on this weeks massive Victory Day memorial march in Moscow, a top Russian diplomat said on Friday. President Vladimir Putin and up to 1 million people marched through central Moscow on Wednesday, in the annual Immortal Regiment rally. People were carrying pictures of beloved lost family members who died in World War II. May 9 is the day that Russia marks as the end of the war. AP reported that Deputy Foreign Minister Oleg Syromolotov said in an interview with the Tass news agency on Friday that several terror groups in western Siberia had collected weapons for the terror attack. Twenty people have been detained and 17 homes were searched as part of the investigation, Syromolotov said. This announcement came by the time Russia is gearing up to host the World Cup soon. Russias top intelligence agency last month reported the arrests of men suspected to have links to terrorist ISIS group in Siberia and the Moscow region.