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Fifteen people died Tuesday when a night time fire tore through a two-storey Moscow market warehouse in which migrant workers from a former Soviet republic were camping out.
"We have found another body and now there are 15," a Moscow emergencies ministry spokesman told AFP.
"They were migrant workers. We are trying to confirm which (ex-Soviet) republic they came from."
Unconfirmed news reports said the migrants were from the impoverished Central Asian nation of Tajikistan. Numerous Moscow markets employ cheap labourers from the region without giving them proper housing or pay.
The blaze broke out early Tuesday at the market on the southern outskirts of the city called Kachalovsky. Officials said it took two hours to put out.
Emergency workers described squalid living conditions in which the workers slept on hard cots that were stacked on top of each other in rows of four without any direct access to the outside.
The workers "lived in a metal annex that was equipped with a space heater", an unnamed law enforcement official told the Interfax news agency.
"They slept in frighteningly tight conditions, on hard bunk cots that were then stacked on top of each other," he said.
Another official said the workers probably left the space heater on all night to stay warm during the frigid Moscow spring. Overnight temperatures plunged below freezing and much of central Russia has been hit by snow.
Russia's Emergencies Minister, Sergei Shoigu demanded an immediate account of how the workers ended up living in a space the market had reserved for storing hardware supplies.
"This is turning into a tradition -- people living in markets," Shoigu said in televised remarks.
"Someone must have settled them there. This facility was completely unsuitable for housing. I ask the law enforcement official to look into this."
The migration service estimates that there are 700,000 Tajiks living officially in the country -- a tenth of their home country's population of just under seven million.
Tajikistan was wracked by a brutal civil war in the early 1990s and then experienced nearly two decades of ethnic tensions and endemic drugs trafficking that hampered sustainable growth.
Its economy remains in tatters and some analysts estimate that up to half of Tajikistan's young male population is currently trying to make a living in Moscow and other major Russian cities.
The overwhelming majority of the migrants who arrive in Moscow do so without acquiring the official city worker permits that the Russian capital has required since Soviet times.