Some 300 people have been arrested in Sudan, following a rebel raid near the capital, Khartoum, state media says.
A BBC correspondent says state security agents have been conducting house-to-house for suspected rebels in the city.
Human Rights Watch said it was worried about the possible mistreatment and torture of detainees in the light Chad closes its border with Sudan ...
Sudan cuts Chad ties after Darfur rebel attack ...
Teenager facing terrorism charges ... of Sudan's record of human rights abuse.
But the government dismissed such fears by saying anyone involved in the attack would receive a fair military trial.
Saturday's raid on Omdurman, Khartoum's twin city across the River Nile, was the closest Darfur's rebel groups had come to the capital in five years of conflict in the region.
Sudan has accused neighbouring Chad of backing the Justice and Equality Movement rebels and cut diplomatic relations.
Chad has denied the charges and closed its border, saying Sudan is planning an attack.
Curfew
The BBC's Amber Henshaw in Khartoum says check-points have been set up across the city.
On Monday, a curfew was re-imposed in Omdurman and our correspondent says the atmosphere remains tense.
Human rights lawyer Salih Mahmoud Osman said scores of Darfuris had been rounded up, including his brother.
The government says it has repulsed the attack but Jem leader Khalil Ibrahim says the rebels will be back.
"This is just the start of a process and the end is the termination of this regime," he told Reuters news agency.
Experts say Chad and Sudan are fighting a proxy war using each other's rebels to achieve their military objectives.
Chad President Idriss Deby has blamed Sudan for supporting a Chadian rebel attempt on the presidential palace in the capital N'Djamena in February.
Sudan's Islamist leader Hassan al-Turabi was accused of having links to the rebels, and was detained on Monday and interrogated for several hours by the security forces over the attack.
He was freed from custody some hours later.
Mr Turabi has in the past denied such allegations, although some Darfur rebel leaders have followed him.
Mr Ibrahim used to follow Mr Turabi and correspondents say they share an Islamist outlook.
Mr Turabi was Sudan's main ideologue in the 1990s before falling out with President Omar al-Bashir. He has since been imprisoned several times.
(BBC)
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