Zimbabwe's Robert Mugabe looked poised to win a seventh term as president after romping to victory in parliamentary polls dismissed as fraudulent by the opposition, as the head of the UN led calls for calm.

Full results were expected later on Saturday but Mugabe's ZANU-PF party said it had already won the 140 seats in parliament required to press ahead with controversial amendments to the constitution.

Al Jazeera's Haru Mutasa reports from Harare.