The office said today that the UN mission in Congo has deployed a team to Goma, the capital of North Kivu province, to monitor the situation and investigate. It also said security forces arrested at least 37 people.
Protesters in Goma yesterday demanded that President Joseph Kabila step down at the end of the year if new elections are not held.
The UN mission says it condemns "all forms of violence and calls for the respect of fundamental rights and freedoms, including the rights to freedom of peaceful assembly and demonstration.
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