It started as a peaceful protest. But allegations of fraud in Mongolia’s elections have turned to violence.
Denouncing preliminary results, demonstrators marched on the headquarters of the ruling party, unconfirmed winners of this weekend’s poll.
Riot police could not stop the crowd reaching the building in the capital, Ulan Bator, and the mood turned increasingly ugly.
Security forces fired tear gas but struggled to bring the situation under control. The stronghold of the Mongolian People’s Revolutionary Party was ransacked and set on fire.
Prime Minister Sanjagiin Bayar’s call for calm and denial of a rigged election had fallen on deaf ears.
The MPRP ruled Mongolia as a Soviet satellite through much of the last century.
The country’s election committee has yet to give final results of the vote. International observers say that, overall, it was free and fair.