The leaders of the Democratic Republic of Congo and Rwanda have signed a peace deal aimed at ending the long-running conflict in the region at a summit hosted by US President Donald Trump in Washington.

Ahead of the summit, there was an escalation in fighting in resource-rich eastern DR Congo between government forces and rebels believed to be backed by Rwanda.

DR Congo's army accused its rivals of attempting to "sabotage" the peace process, but the M23 rebels said the army had launched an offensive in breach of a ceasefire.

At the start of the year, the M23 seized large parts of eastern DR Congo in an offensive that saw thousands killed and many more forced from their homes.

At the beginning of the event at the newly-renamed Donald J Trump Institute of Peace, Trump said the peace ceremony was a "great day" for Africa and the world.