At least 36 Burundian refugees have been killed in clashes with Congolese security forces who allegedly fired indiscriminately at protesters. <br/><br/>United Nations envoy to Congo, Maman Sidikou today said today that he was "deeply shocked" at the violence, which erupted on Friday. Another 117 people were injured and one Congolese officer was killed, he said in a statement. <br/>The UN envoy called for a swift investigation and urged Congo's security forces to use force as a last resort.<br/>Roughly 44 thousand refugees from Burundi are sheltering in Congo.