UN Secretary-General Ban Ki- moon on Monday voiced his 'heartfelt condolences' over the tragic loss of lives in the wake of derailment of an express train running from Moscow to St. Petersburg in Russia on Friday night, a UN statement issued here. The statement, issued by his spokesperson Michele Montas, said: 'The secretary- general expresses his heartfelt condolences over the tragic loss of lives resulting from the sabotage and derailment of an express train running from Moscow to St. Petersburg on Nov. 27, 2009.' 'At this moment of grief, his thoughts go out to the victims and their families,' the statement said. 'The secretary-general wishes the many injured a swift recovery, and hopes that investigations currently being conducted will shed more light on the circumstances surrounding this tragic incident.' A homemade chemical bomb planted on the tracks in an apparent act of terrorism derailed a high-speed train in Russia carrying hundreds of people Friday night, killing at least 26 and injuring scores more, reports said. The head of the Russian Federal Security Service told the country's news agency Interfax that traces of explosives were found at the train crash site, including chemical residue from a homemade bomb. The luxury train carrying more than 600 passengers is popular with business executives and government officials. Among the dead are Boris Yevstratikov, the head of the Russian State Reserves Agency, and Sergei Tarasov, a former senator from St. Petersburg, reports said. 