Algerian President Abdelaziz Bouteflika has replaced his powerful intelligence chief, a security source said on Sunday, in the latest move in a shake-up of the country's security forces.

General Mohamed Mediene, better known as Toufik, had held the post for 25 years before being replaced by his deputy, General Bachir Tartag, the source said.

The announcement came a day after Bouteflika's chief of staff confirmed the arrest last month of the former head of counter-terrorism.