KHARTOUM, April 8 (Xinhua) -- Former U.S. President Jimmy Carter on Thursday arrived in Khartoum to take part in monitoring Sudan's General elections, slated for April 11.

He expressed regret over pulling out of candidates of some opposition parties from the elections, especially Yassir Arman of the Sudan People's Liberation Movement (SPLM).

"I regret that some of the parties decided not to participate", Carter told reporters upon arrival at Khartoum airport Thursday.

He refused to describe his impression about the preparations for the electoral process and said that the final assessment would be after the elections.

The U.S.-based Carter Center, which was founded by Jimmy Carter, have sent 65 observers to Sudan elections to monitor the general election in this African country besides the European Union observation team which includes 130 observers.

The Sudanese National Elections Commission (NEC) said over 100 national and foreign observers will be monitoring the elections at all stages.

Sudanese President Omar al-Bashir on Wednesday said he welcomes the Carter Center, and pledged to facilitate its movement in all states of the country.

Multi-party elections, the first of its kind in more than 20 years, are scheduled to be held in Sudan on April 11, 2010.