Elections went smoothly in 28 constituencies in Bangkok but the remaining five ran into trouble.
Voters show their identity cards and demand their right to vote during a protest at Din Daeng district office. The district called off voting in its constituencies after the office was blockaded by anti-government protesters. Pattanapong Hirunard
Annop Likhitjittha, chairman of Bangkok's election committee, said the election went well in most of the city's 6,671 polling stations.
The elections proceeded as planned in 6,155 polling units in 28 constituencies while 516 polling units, or 7.73%, in five constituencies could not hold elections due to a variety of problems.
Problems were reported in Constituency 5 covering Ratchathewi district and Constituency 6 covering Din Daeng district.
Protesters surrounded the two district offices to prevent ballot boxes from being distributed to polling stations.
In Constituency 11 in Laksi district, the election was cancelled after a clash between pro-election and anti-election groups which left six people injured on Saturday afternoon.
Constituency 15 covering Bang Kapi district failed to hold elections in 38 polling stations because the number of election personnel at each station fell short.
In Constituency 16 covering Bung Khum district, 10 polling units could not hold elections because there were not enough election officials to operate them.
In some constituencies, many voters could not find where polling stations were located as the locations which were familiar to them in the previous polls had been changed.
This is because land owners or company owners refused to allow their premises to be used as polling stations out of concerns for their safety.
In Din Daeng district, authorities cancelled the election after officials were unable to take ballots to polling stations.
The decision infuriated hundreds of voters. They clashed with anti-government protesters, who had stopped the ballots being moved, and later stormed the district office building, calling for authorities to take responsibility for cancelling the poll.
Earlier, district chief Itsalamet Khachanukun called off the election after the ballots, which were kept at the office, could not be carried to 175 polling stations because the office's gates were blocked by about 500 supporters of the People's Democratic Reform Committee early in the morning.
The PDRC protesters left the venue after 10am but were confronted by angry voters near the Thai-Japanese Stadium.
The two sides threw rocks and water bottles at one another for about five minutes. There was no report of injuries.
PDRC supporters eventually returned to their rally site at the Victory Monument.
Yet the voters remained angry. They gathered at the Din Daeng district office before breaking the door to enter its building.
''We want to expel the district chief,'' said Suphawadi Hemasiri.
Another Din Daeng resident, Kanwichak Trikamon, blamed Mr Itslamet for not being well-prepared for the election protest. He should have taken ballots out of the office one or two days before election day, she said.
She said she was not a fan of red-shirt or yellow-shirt supporters but she just wanted to preserve her democratic rights.
Mr Itslamet said Din Daeng election was not only disrupted by the blockade but the district also lacked more than 800 staff to oversee polling stations.
The district later decided to cooperate with police by accepting complaints.