The proceedings concern the possible use of falsified documents during the construction process. The bureau says there's proof of an official falsifying documents last year.
The reconstruction of Barona street started last September but the costs grew €200,000 on top of the initial €3m. Another €1m is required to renovate the sidewalks.
Previously the Rīga City Council planned to finish the roadworks on Barona street by September, however as late as October the council said extra work may have to be carried out on the street.
The work on one of the Latvian capital's main streets has formed a main topic of conversation for Rigans for more than a year, with many complaining of eccentric planning, poor quality works and numerous other niggles.
It looks like the renovation of Barona street will remain in the headlines for some time to come.