 On 2 May 2007, a criminal investigation was opened into the attacks under a section of the Estonian Penal Code criminalising "computer sabotage" and "interference with the working of a computer network", felonies punishable by imprisonment of up to three years.As a number of attackers turned out to be within the jurisdiction of the Russian Federation, on 10 May 2007, Estonian Public Prosecutor's Office made a formal investigation assistance request to the Russian Federation's Supreme Procurature under a Mutual Legal Assistance Treaty (MLAT) existing between Estonia and Russia.A Russian State Duma delegation visiting Estonia in early May in regards the situation surrounding the Bronze Soldier of Tallinn had promised that Russia would aid such investigation in every way available.