Armenian opposition leader calls for renewed protests

Supporters of Armenia's opposition are calling for more protests after planned talks with the ruling party were cancelled.

Many want a transitional government and new elections after Prime Minister Serzh Sargsyan resigned.

But tens of thousands marched for a different cause on Tuesday, to commemorate the mass killing of Armenians during World War One.  

Al Jazeera's Robin Forestier-Walker reports from Yerevan.