GOMA, Congo — Rwandan-backed rebels pushed into the outskirts of the strategic city of Uvira in eastern Congo on Tuesday, local authorities said, as part of a new offensive that the U.N. says has displaced more than 200,000 residents in recent days.

The latest offensive by the Rwandan-backed M23 rebel group comes despite a U.S.-mediated peace agreement signed last week by the Congolese and Rwandan presidents in Washington. The accord did not include the rebels, who are negotiating separately with the Congo and agreed earlier this year to a ceasefire that both sides accuse the other of violating, but it obliges Rwanda to halt support for armed groups and work to end hostilities.

Marafiki Masimango, a representative of Uvira civil society, said rebels were pushing south into the South Kivu

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