World Bulletin/News Desk

Sudan's opposition alliance, the National Consensus Forces (NCF), said Sunday that it plans to file a lawsuit against the arrest of its leader Farouk Abu Issa along with a civil society activist on Saturday.

"The NCF's legal committee is examining the details of the case in order to file a lawsuit against the detainment [of Abu Issa], which contravenes the law and the constitution," NCF member and head of Sudan's Ba'ath Party Mohamed Diaa said at a press conference.

Diaa did not specify whether the legal action would target the National Intelligence and Security Service or another body, noting that the legal committee will make that decision.

He also added that the NFC plans to take escalatory measures ,without providing further detail on what such measures would be.

"This repressive act will not go unnoticed and all opposition parties will unite against the regime to remove it and establish a democratic alternative," Diaa added.

Sudanese government officials could not be reached for an immediate comment on Diaa's remarks.

On Saturday, spokesman for Sudan's opposition Congress Party Bakri Youssef told The Anadolu Agency that a security force grabbed NCF leader Abu Issa and his grandson from the former's home and placed him in one of the detention centers run by the National Intelligence and Security Service in Khartoum.

Security forces also arrested activist Amin Mekki Medani, Youssef added, noting that their arrest could be related to the pair's signing of the "Call for Sudan" document with leaders of the country's armed groups on Wednesday in Addis Ababa.

Abu Issa and Medani have recently returned from the Ethiopian capital, where they signed the "Call of Sudan" with the armed opposition Revolutionary Front – a move that was slammed by Khartoum as constituting "a betrayal to the nation."

The front is an umbrella alliance of four armed groups fighting the government army in eight provinces.

The "Call of Sudan" declaration stressed "the importance of the dismantling the one-party state in favor of a state of equal citizenship."

It also calls for "utilizing mass communication methods to initiate a popular uprising."