Statistically, there is some great chances this fire was possibly caused by an improper electrical installation from the Soviet era with an iron wire as electrical fuse, the garage was also looking made of wood logs.
"Renewable fuses (rewirable or cartridge) allow user replacement, but this can be hazardous as it is easy to put a higher-rated or double fuse element (link or wire) into the holder (overfusing), or simply fitting it with copper wire or even a totally different type of conducting object (hairpins, paper clips, nails, etc.) to the existing carrier. One form of fuse box abuse was to put a penny in the socket, which defeated overcurrent protection and resulted in a dangerous condition. Such tampering will not be visible without full inspection of the fuse. Fuse wire was never used in North America for this reason, although renewable fuses continue to be made for distribution boards."
http://en.wikipedia.org/wiki/Fuse_(electrical)
I put a smoke alarm near my old rewirable 20A fuse boxe, by the way, Peugeot now sells their iOn with a 10 A, 220 V electrical battery charger, because with the 16 A, 220 V charger, the female plug in some installations was getting warm with time.
Home electrical fires.
In 2009, an estimated 44,800 home structure fires reported to U.S. fire departments involved some type of electrical failure or malfunction as a factor contributing to ignition. These fires resulted in 472 civilian deaths, 1,500 civilian injuries, and $1.6 billion in direct property damage. http://www.nfpa.org/assets/files/pdf/os.electrical.pdf
Examples of unsafe home conditions that can lead to fire include:
•Damaged extension cords, electrical conductors or plug wires
•Short or overloaded circuits
•Use of modified, unapproved or faulty electrical equipment
•Insufficient clearance between combustibles and electrical heating equipment
•Loose electrical connections
http://sewelldirect.com/articles/Cable-Fire-Safety.aspx
http://www.deficonso.com/V1965