In a key democratic transition, the centre-right Pakistan Muslim League Nawaz (PML-N) emerged the winner after a huge turnout of 60 per cent -- the highest in the country since 1977.
The Free and Fair Election Network (FAFEN), an alliance of 42 civil society organisations working on democracy and election monitoring, praised the election commission for a smooth process.
It said voters defied direct threats of violence and queued up at the polling stations to produce "a relatively high turnout and public enthusiasm".
"According to reports so far, 693 irregularities were recorded at 3,500 polling stations. Out of which up to 40 events were of illegal and fraudulent voting," he said.
About 36 polling stations and booths were illegally occupied, 121 observers were not allowed to work and 30 were beaten up, FAFEN said.
"PML-N workers beat one of our observers in (the Punjab town of) Jehlum and MQM assaulted one in Karachi who had to be hospitalised," said Islam.
Pakistan's election commission has ordered a re-vote in 43 polling stations in one Karachi constituency over allegations of ballot stuffing.
