A Portuguese branch of the Anonymous hacking group says it has shut down about 20 Angolan government websites in retaliation for the jailing of 17 youth activists for plotting a rebellion against President Jose Eduardo dos Santos' government.

The youth, who include prominent rapper, Luaty Beirao, were sentenced on Monday to between two and eight-and-a-half years by a court in the former Portuguese colony.

Anoymous listed the websites it had targeted in a Facebook post as none of the sites were accessible when it checked, AFP news agency reports.

The government has not yet commented on the alleged cyber-attack.

Rights groups condemned the sentencing of the 17 as a travesty of justice, and a sign that Mr Dos Santos' government was becoming increasingly repressive.

The activists were arrested in June after discussing a book about non-violent resistance at their book club.

Mr Dos Santos has ruled oil-rich Angola since 1979.

Below are full list of the federal government's websites hacked by the annonymous group which they posted on Facebook