The UN human rights chief voiced alarm Friday at the spiraling violence in Burundi, decrying allegations of security forces gang raping women, ethnic killings and mass graves filled with more than 100 bodies.

The UN human rights chief voiced alarm Friday at the spiraling violence in Burundi, decrying allegations of security forces gang raping women, ethnic killings and mass graves filled with more than 100 bodies.

"All the alarm signals, including the increasing ethnic dimension of the crisis, are flashing red... A complete breakdown in law and order is just around the corner," Zeid Ra'ad Al Hussein warned in a statement.