Astana, Kazakhstan (Reuters): A Russian citizen of Central Asian origin is suspected of being behind the deadly blast in Russia's St. Petersburg, killing 11 people and injuring 45 others, a senior Kazakh security official said on Tuesday, adding that the suspect was not from Kazakhstan .

Kazakhstan 's National Security Committee (KNB) is working together with Russian security services and exchanging information on the investigation, KNB deputy chairman Nurgali Bilisbekov told a government meeting.