Passport images belonging to one of the two main suspects link him to the Russian military and suggest he used an alias to plot the coup.
An old passport is issued in the name of Eduard Shishmakov. It describes him as the assistant military attache at the Russian Embassy in Poland.
A more recent passport issued in August 2016, just two months before the attempted coup, has a photo of the same man, with the same birth date, but a different surname - Shirokov.
Western intelligence say it is proof Shirokov was a GRU officer and is connected to Moscow. They have described the coup attempt as "further evidence of aggressive Russian involvement in the heart of Europe".
In a further development, Polish authorities have provided us with a statement claiming that Eduard Shirokov was thrown out of Poland:
"We would like to inform you that Eduard Vadimovich Shishmakov was identified as GRU and in October 2014 he was declared persona non grata by the Polish government," they said to us in a statement.
"This decision was taken after discovering his involvement in intelligence activities."
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