An explosion destroyed a grocery store in the southern Russian region of Ingushetia on Friday, leaving at least four people dead, officials said, according to AP. Six people who were pulled from the rubble have been hospitalized, three of them in serious condition, emergency officials said. The cause of the blast at the Enigma store in the city of Nazran was not immediately certain, but officials said a gas leak appeared likely. The wholesale grocery store and an adjacent liquor store were destroyed in the explosion. In the nearby Dagestan region, police said an explosion killed a pedestrian Friday morning. An explosive device was placed under a bench near the city administration building in Makhachkala, the region's capital, and it blew up as a woman was walking by, police official Shamil Guseinov said. The explosion was under investigation, he said.