US President Barack Obama on Thursday condemned the suicide attack in southern Russia's Caucasus region that killed at least 17 people and injured 130 more, calling it a horrific tragedy. "The United States strongly condemns the terrorist bombing that occurred today in Vladikavkaz, North Ossetia," President Obama said in a statement released by the White House. The US President offered sympathy to the people of North Ossetia, "who have already suffered so much from horrific acts of terrorism. We offer our deepest condolences and stand with the people of Russia in this time of tragedy." "This bombing further underscores the resolve of the United States and Russia to work together in combating terrorism and protecting our people," President Obama wrote. Officials said the explosion in the city of Vladikavkaz was caused by a suicide bomber who drove to a local market in an explosives-packed car.