Voting in the second round of parliamentary elections in the Republic of Congo is reported to have got off to a slow start.
President Sassou-Nguesso has been accused of poll-rigging
Local and international observers criticised the conduct of the first round in June.
Critics say the poll was marred by poor organisation, logistical problems and allegations of vote rigging.
The opposition accuses the government of President Denis Sassou-Nguesso of organising a "masquerade".
The government-appointed electoral commission says it has made changes to ensure voting goes more smoothly this time.
But the poll is boycotted by some 40 parties.
They claim it is aimed at shoring up President Sassou-Nguesso, who has ruled the country for most of the past 28 years.
Of the 53 members of parliament elected in the first round, from a total of 137, three were members of the opposition.