South Sudan's main political party has announced a partial boycott of the elections scheduled for April 11.
The Sudanese People's Liberation Movement (SPLM) has withdrawn its candidates from local and parliamentary polls in North Sudan.
Earlier this week it withdrew its candidate from the presidential election.
The National Umma Party, another opposition group, will decide on Wednesday whether it will also stage a boycott.
Al Jazeera's Mohammed Adow reports from Khartoum on the fallout from the political standoff.
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