An armed group has stormed a police station in Armenia's capital, Yerevan, taking hostages and calling for the release of "political prisoners," reports the BBC.
The group released a video demanding opposition leader Jirair Sefilian and a number of others be freed.
It called on Armenians to take to the streets in support.
Mr Sefilian has strongly criticised President Serge Sarkisian and his handling of the conflict in the Nagorno-Karabakh region.
There are reports that several people have been wounded in the Yerevan attack.
The CivilNet newspaper identified the group as the Daredevils of Sassoun and said its members had released a video in which they say: "Dear friends, citizens, Armenian nation, it has begun, we are doing this for you... Go out to the streets!"
CivilNet said seven policemen were being held hostage but this has not been independently confirmed. The group was quoted as saying it would retaliate if attacked and had no intention of surrendering.
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