Demonstrators, Armenia police clash outside station

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)

Armenian protesters run away from a light grenades as they clash with police officers near the area around a police station in Yerevan, Armenia, Wednesday, July 20, 2016. Demonstrators and police have clashed outside a police station in the Armenian capital where armed supporters of a jailed opposition leader have held hostages for four days. (Hrant Khachatryan/PAN Photo via AP) (The Associated Press)

Armenian protesters clash with police officers near the area around a police station in Yerevan, Armenia, Wednesday, July 20, 2016. Demonstrators and police have clashed outside a police station in the Armenian capital where armed supporters of a jailed opposition leader have held hostages for four days. (Hrant Khachatryan/PAN Photo via AP) (The Associated Press)

Demonstrators and police have clashed outside a police station in the Armenian capital where armed supporters of a jailed opposition leader have held hostages for four days.

It wasn't immediately clear if there were any serious injuries Wednesday evening in which demonstrators supporting the gunmen threw stones and other objects at police surrounding the station. Police responded with tear gas and sonic grenades.

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. One police officer was killed in the seizure and four others wounded. Five officers continue to be held as hostages.

Sefilian was charged with illegal possession of weapons. Investigators claimed he and his supporters were planning to seize government buildings.