Deadly blast reported at Russian subway station in St. Petersburg

ST. PETERSBURG, Russia — At least 10 people were killed Monday in an explosion on the subway in St. Petersburg, Russian news agencies reported.President Vladimir Putin, who was visiting the city on an unrelated trip Monday, said investigators were looking into whether the explosion was a terror attack or if there might have been some other cause. He offered his condolences to the families of those killed.Russia's National Anti-Terrorist Committee, which said "several" people were killed an