Another functionary, Igor Wagenfeld, is suspected of receiving bribes for hiring experts and consulting engineers. Apparently, a fixed percentage of the payments was being transferred to his brother's foreign account. He declared that the police is trying to inflate his influence and he was never in a position to hire consultants. Source: Globes.
I think that the police has nothing solid so they are applying pressure a large group in the hope that, trying to save themselves, will complicate each other. It may work.