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.