Russia's Ministry of Emergency Situations says six people -- including four children aged three or younger -- have been killed in a fire in the Yaroslavl region northeast of Moscow.
The fire broke out on the evening of January 2 in a 100-year-old building in the village of Pesochnoye.
More than 20 people who were living in the building were left homeless by the blaze.
Authorities said they were investigating two possible causes of the fire -- either carelessness or a short circuit in the building's electrical system.