Defections intensify within South Sudan's military.

The head of the country’s military justice Col. Khalid Ono Loki has resigned.

He denounces arbitrary arrests and detention for several months without any inquiry or charges against individuals who do not hail from the Dinka tribe.

“You have indeed brought shame and an unfamiliar ethos to South Sudan that will only lead the country to more calamities,” Khalid wrote on Friday.

He added: “Based on this nutshell of evidences, Mr. Chief, I have provided herein, I can no longer continue with such a corrupt, ethicized and unethical institution.”

His resignation comes just a few days after that of General Thomas Cirillo Swaka, deputy of the logistic department in the central command.

He has accused Salva Kiir and other officers from the Dinka tribe of ethnic cleansing.

Labour minister Gabriel Duop has also announced his resignation and full allegiance to opposition leader and former vice-president Riek Machar whose troops have been battling with government forces.

More than one million people have fled South Sudan since the conflict erupted in December 2013 after Kiir fired Machar as vice president, the largest mass exodus of any conflict in central Africa since the 1994 Rwandan genocide.