The East African nation has been unearthing such graves from a past that includes massacres along ethnic lines.

Two senior army officers and a police general accused of taking part in an attempted coup in Burundi have been arrested, a presidential spokesman said as it became apparent that a military plot to oust president Pierre Nkurunziza had fizzled out.

The UN Security Council strongly condemned a rebel offensive on Burundi’s capital which the United Nations said has killed up to 20 civilians, injured as many as 100 and displaced another 5,000 this week.

The leader of an attempted coup against President Pierre Buyoya is mentally unstable and misled his followers, a senior army official said today, as Burundians continued to puzzle over the strange incident.