5 Armenian policemen still held hostage a day after attack

Armenian police and special forces block a street leading to the area around a police station in Yerevan, Armenia, Sunday, July 17, 2016. Armenia security forces say a group of armed men has attacked a central police station in the Armenian capital, killing one officer, wounding two and taking others hostage. (Hrant Khachatryan/PAN Photo via AP) (The Associated Press)

An opposition member of Armenian parliament, Nikol Pashinian, second left, who went to the station to meet with the attackers, speaks to the media at the area near a police station in Yerevan, Armenia, Sunday, July 17, 2016. Armenia security forces say a group of armed men has attacked a central police station in the Armenian capital, killing one officer, wounding two and taking others hostage. (Varo Rafayelyan/PanPhoto via AP) (The Associated Press)

Protesters take a part in a peaceful march in Yerevan, Armenia, Monday, July 18, 2016. About two hundred opposition supporters reached an agreement with police to hold the march as long as they did not march to the besieged police station. (Aram Kirakosyan/PAN Photo via AP) (The Associated Press)

Armenia's security forces say armed supporters of a jailed opposition leader are still holding five policemen hostage a day after attacking a police station in the capital and killing one officer and wounding four others.

The National Security Service said in Monday's statement that one of the officers held hostage and also an ambulance driver were freed overnight as a result of prolonged negotiations and undefined "special measures."

More than 20 armed men took over the police station in Yerevan on Sunday to demand the release of Jirair Sefilian, who was arrested last month.

Sefilian, a leader of the opposition group Founding Parliament, was charged with illegal acquisition and possession of weapons. His group has called for the government of the former Soviet republic to step down.