The Investigative Committee added that it was examining other theories such as a short circuit or arson.
The fire is now 25 percent contained and the cause hasn't been determined, though investigators are looking into whether it was lightning, an accident or arson.
The cause of the blaze, which broke out around 2 a.m. at Psychiatric Hospital No. 14 in Ramensky, about 80 miles north of Moscow, had not been determined and authorities were looking at the possibility of an electrical malfunction or arson and had opened a criminal investigation, Russia's Investigative Committee said.
Police said they had identified numerous suspects that could be charged with riot or attempted arson through video footage.
Two review committees determined that there is no longer enough evidence available to tell whether or not arson was in play.
Likewise religious shrines, which are considered unorthodox by Salafis, have been damaged or destroyed by arson attacks around the country.
No one rules out arson by someone or other, but neither is misfortune discounted, as the result, say, of an electrical fault or faults.
"It could be something where someone is preparing for something bigger, or it could be juvenile, " said Austin chief arson investigator Aaron Woolverton.
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Those with surveillance camera footage or personal camera and cellphone video of this and other acts of arson are encouraged to call LAFD Investigators.
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Of course, the potential doesn't end at remote arson, an attacker could easily gain access to a network or steal documents, and hijacking the lowly device would require little more than printing an infected file.
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The notion that a flammable or combustible liquid caused flames to reach higher temperatures had been repeated in court by arson sleuths for decades.
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