"Several minutes ago, fire was opened from the police station. As a result, police officer Yura Tepanosyan, born in 1986, who was in a car at a distance of 350-400 meters [1,150 – 1,300 feet], was killed," Ashot Aharonyan wrote on his Twitter page.
Earlier on Saturday, the Armenian National Security Service demanded that members of an armed group that captured the police station in Yerevan must surrender until 5:00 p.m. local time (13:00 GMT).
"We offer members of the armed group to lay down arms and to surrender to authorities without resistance at 5:00 p.m. (13:00 GMT). Otherwise special police units are empowered to open fire and to neutralize every armed man at the police station as well as outside it," the statement said.
The Armenian National Security Service added that every attempt to enter the police station would be regarded as abetting terrorism.
On July 20, the group's supporters clashed with police. Following the clashes 51 people, including 29 policemen were injured, while police detained 136 people.
The group continues to occupy the seized building demanding the release of Jirair Sefilian, an opposition politician and founder of the New Armenia Public Salvation Front.