But, after initially welcoming in the observers - from the European Union, African Union and other groups - the Algerian government has blocked their access to national election lists.

The foreign ministry has also warned them to act with "discernment, impartiality and objectivity and with discretion, far from polemics or escalation that could prejudice the credibility of its mission".

Analysts say voter apathy is widespread, particularly among young people.

Under pressure to reform after last year's "Arab Spring" revolts in neighbouring countries, President Abdelaziz Bouteflika approved the establishment of 23 new political parties and an increase in the number of seats in parliament to 462.