US officials are organising crisis talks in Sudan after main opposition parties announced a boycott of upcoming elections.
They are calling on President Omar Hassan al-Bashir to answer complaints about fraud in a presidential and parliamentary ballot due on April 11.
At least five political parties have decided to pull out of the polls.
Yasir Arman from the Sudan People’s Liberation Movement said: “The election for the president is meant for one person and it’s not meant for a democratic process or for the Sudanese people. It was only meant to save General Bashir from the ICC.”
The ICC is the International Criminal Court.
As well as the claims of fraud, the opposition is voicing concern about continuing insecurity in the Darfur region.
The new elections were seen as crucial for the implementation of a peace deal struck in 2005, which ended more than two decades of civil war.
The US envoy to Sudan is holding talks with opposition and government figures.