KHARTOUM, April 14 (Xinhua) -- Sudan's National Elections Commission (NEC) said on Wednesday it was considering the possibility of postponing the ongoing general elections at some constituencies due to errors in polling cards and symbols of candidates.

"We will study the situation in these constituencies, and if the problem is not tackled, we will abide by the law, which authorizes us to postpone the elections at those constituencies," Abdalla Ahmed Abdalla, NEC deputy chairman told reporters in Khartoum.

The NEC acknowledged technical and administrative mistakes in the first polling day of Sudan's first multi-party elections in 24 years, and also decided to extend the polling period of the elections for two extra days.

The NEC said they had corrected the mistakes, which involved voters' lists and names of some candidates, and the polling process had proceeded normally after correcting those errors.

Meanwhile, former U.S. President Jimmy Carter, whose Carter Center is monitoring the Sudanese elections, met on Wednesday with NEC officials in Khartoum and reviewed the electoral process.

"We have a number of questions to ask the national elections commission members and they have responded to our questions adequately," Carter told reporters following the meeting.

He said they asked the NEC officials about the technical errors and why some voters have had difficulties in finding their names on the voters' lists.

"We also asked what will happen if there are some miss-printed ballots or if people voted erroneously," he added.

The Carter Center, which is the only U.S. nongovernmental organization authorized by the Sudanese government to monitor the general elections, has 65 observers to monitor Sudan's elections, besides other foreign observers from the European Union, the Arab League, the African Union and around 20,000 national observers.