KHARTOUM, April 6 (Xinhua) -- Sudan People's Liberation Movement (SPLM), a main partner in the Sudanese power-sharing government, declared Tuesday a total boycott of the country's general elections in the northern states in protest of "ballot rigging" measures by Khartoum.

Yet, the movement said the decision will not apply to the states of South Kurdufan and Blue Nile, two strongholds of the movement in the north.

"SPLM's north sector decided to boycott the elections in all northern states, except in South Kurdufan and Blue Nile, where we are certain to win the polls," SPLM Secretary General Pagan Amum told reporters in Khartoum.

The decision came in protest of the ruling National Congress Party (NCP)'s continuation to take measures with the aim of rigging the elections, slated for April 11, he said.

"The National Congress is going ahead with its plan to rig the elections, and we cannot partake in unfair elections," he said.

Sudan will hold its first multi-party elections in 24 years, a main landmark achievement of the Comprehensive Peace Agreement ( CPA) signed between the NCP and SPLM in 2005 to end a 20-year-long conflict between the north and south.