"The escalation of fighting in Jebel Marra has led to large scale displacement," Ladsous said. "Humanitarian organizations estimate that as of 31 March, at least 138,000 people from Jebel Marra have been newly displaced in North, Central and South Darfur.
Ladsous noted that because of Sudan government's access restrictions, "the exact number of civilian casualties from the recent wave of belligerence cannot yet be ascertained."
The United Nations estimates that 300,000 people have been killed in the violence and another 2.5 million people displaced.
In 2009, the International Criminal Court (ICC) based in the Netherlands indicted Bashir on charges of directing a campaign of mass killing, rape and pillage.
Bashir was the first sitting president to be charged by the ICC. The Sudanese leader has said he does not recognize the authority of the court.