Investigations have been continuing in connection with the murder of the chief of Armenian state television and radio.
Our correspondent says three members of the Karabakh war veterans "Tigran Mets" were detained today in connection with the murder. They were later released, along with a colleague who was detained the previous day.
The group takes a hard line in the dispute with Azerbaijan over Nagorno-Karabakh, a mostly ethnic Armenian enclave within Azerbaijan. However, the group has denied any involvement in the death of Naghdalian.
Yesterday, authorities said they had detained several other suspects. Tigran Naghdalian -- a supporter of President Robert Kocharian -- was fatally wounded when shot by a gunman on Saturday after leaving his parents' home in the capital Yerevan.