Four members of one family were killed after an explosion caused by a gas leak ripped through a house in the capital of Russia's Daghestan, Makhachkala. Authorities in the North Caucasus region said a woman, whose three children were killed by the blast a day earlier, died in the hospital on January 19. The woman's husband remains in intensive care. Investigators say the blast was caused by tampering with a segment of the house's gas pipe. Gas explosions occur frequently across Russia due to aging pipelines and infrastructure, as well as lax safety standards. To read the original story by RFE/RL's Caucasus.Realities, click here.