"We confirm that the prosecutor's office has declared the pretrial investigation of the criminal case closed," spokesperson for the Office of the Prosecutor General, Kristina Kostina, said on Tuesday. Kostina added that the total number of suspects in the criminal case was 15, including physical as well as legal persons.

Kaljurand's defense attorney, Paul Keres, and Kiili's attorney Aivar Pilv, were granted access to the documents at the end of last week, and they can submit requests until the end of July. After reviewing the requests, the prosecutor's office will make a decision regarding drawing up a statement of charges.

The ISS detained Kiil and Kaljurand on Aug. 26, 2015. On the same day three more people were detained as suspects in a graft case, and another three as suspected accessories, but released a few days later. Kaljurand and Kiil were released at the beginning of January this year, but placed under electronic surveillance. Later on two people connected with the Polish shipyard that was at the time building the new ferries for Port of Tallinn subsidiary TS Laevad were declared suspects as well.

The former board members are suspected of having accepted bribes on a large scale over a period of several years at least since 2009. The prosecutor's office has said that the placement of orders for the construction of two new ferries at a shipyard in Gdansk, Poland is a central point of the investigation.