The release of Drareni and pro-democracy activists advocating for reform in Algeria is being seen as a step to appease protesters in the country.
A former prime minister was elected Algeria's new president but protesters who toppled his predecessor marched again on Friday, vowing their movement would not stop.
Arrests marred celebrations in Paris after Algeria's footballers defeated the Ivory Coast on penalties to qualify for the Africa Cup of Nations semi-finals.
Algerians use independence day celebrations for pro-democracy campaign
An Algerian military judge on Sunday placed in custody the youngest brother of former
President Abdelaziz Bouteflika and two former intelligence chiefs, state TV reported.
Eighty police officers injured and hundreds arrested in the latest anti-government protests in Algeria
There have been frequent demonstrations in Algeria against Bouteflika running for a fifth term as president.
Algeria's president appoints caretaker government amid turmoil
Army chief of staff, head of the employers' union, a workers' union, and a coalition government — these are the key players in Bouteflika's political regime.
Bouteflika's own party, the National Liberation Front (FLN), joins the army's chief of staff and the National Rally for Democracy party's call for the ailing president to resign.