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Mr. Mohamad, the Web developer, was seized at the Friday protest, as he tweeted about arrests by agents of the notorious National Security Services in Khartoum’s Burri district.

Friends say he may have been targeted because of his video aired the same day on Al Jazeera English TV.

“After 23 years of oppression and injustice, poverty and crime that are all committed under the current regime, change now is an inevitable must,” he said in the video.

His detention shows how the regime sees information about the protests as the biggest threat, said a friend of Mohammed who was held twice in custody, including once for 11 hours without water.

“He is detained for a month, a treatment reserved usually for a ringleader,” said the friend, who asked not to be identified because he feared retribution from authorities.

Activists report arbitrary arrests of protesters and bloggers and their families in the middle of the night. They said many have been beaten while in detention. Two Egyptian female journalists reporting for foreign media amid the unrest were deported.