Armenian President Serzh Sargsyan on Tuesday met with Russian Investigative Committee Director Alexander Bastrykin, who has arrived in Yerevan to coordinate the investigation into the criminal case against Russian serviceman Valery Permyakov, who is charged in the killing of seven people in Gyumri, Armenia.

"The president of Armenia said the tragedy that occurred in Gyumri on January 12 needs to be investigated with unprecedented consistency. The president said it is important that the cooperation established between the Armenian and Russian law enforcement agencies in connection with this investigation should effectively continue and the process should be brought to its logical completion,' the Armenian presidential press service told Interfax.

Bastrykin, for his part, reiterated that the Russian law enforcement agencies and their Armenian colleagues complete understanding and a clear vision of the assistance that should be provided to the Armenian law enforcement agencies in this investigation.

"The purpose of the actions conducted by the Russian authorities on the territory of the military base in Gyumri and on the territory of Russia consists in ensuring a comprehensive investigation into the motives of the killings and the circumstances of the case, finding the culprits and ensuring unavoidable punishment. Bastrykin said he is confident that a public trial of this case, which will take place in Armenia, will indicate the parties' wish to do justice," the presidential press service said.

Bastrykin arrived in Yerevan at the invitation of Agvan Ovsepyan, the head of the Armenian Investigative Committee, on Monday.

"Alexander Bastrykin has arrived in Yerevan to coordinate the work of the military investigators who are investigating the criminal case against Valery Permyakov," Vladimir Markin, an official with the Russian Investigative Committee, told Interfax.

According to earlier reports, a family of six, including a two-year old child, were murdered in Gyumri, northern Armenia, on January 12. The only survivor, six-month-old Sergei Avetisyan, was hospitalized with a stab wound. He died on January 19.

Valery Permyakov, a serviceman from Russia's 102nd military base, who is deployed in Gyumri, was detained shortly after the attack. He is now on the territory of the military base. Criminal charges were brought against him on January 14 based on the Russian and Armenian Criminal Codes.

On January 15, protests broke out in Gyumri. Their participants demanded that Permyakov be handed over to the Armenian justice system. Fourteen people, including five policemen, were hospitalized after clashes between the demonstrators and police.

On January 18, Russian President Vladimir Putin called his Armenian counterpart Serzh Sargsyan to again extend his condolences to the victims' relatives and all people of Armenia in regard of the tragedy in Gyumri.