A Malaysian election monitor group today warned of fraud in tomorrow's polls amid reports of transport being arranged for voters by political parties.

"Tens of thousands of alleged voters are being flown and bussed to key battleground states and constituencies," the Coalition for Free and Fair Elections (Bersih) said.

Tengku Adnan Tengku Mansor, secretary-general of the ruling National Front, conceded that its allies had organised chartered flights to transport voters to their home states, but denied that they were phantom voters.

"The flights in question were organised and paid for by Friends of Barisan Nasional (National Front)," he said. "They brought registered voters to their home so that they may vote in the upcoming elections."

He said the opposition also chartered buses to bring voters back from Singapore.

Adnan said even Bersih "has paid for Malaysians to fly back from Shanghai and Hong Kong."

Elections Commission chief Abdul Aziz Yusof said it is not an offence to pay for travel expenses of voters as long as the sponsor does not instruct the voters to support specific political parties or candidates.

"We will assist in making sure that there are no phantom voters," deputy national police chief Khalid Abu Bakar said.

"If election commission officers inform us that unregistered voters are trying to come in, we will take action," he said. More than 100,000 police will be mobilised during election day.

Khalid said police would also prevent attempts to hold street demonstrations.

The commission said 13.3 million people were eligible to cast their votes for 222 parliamentary seats and 505 state assembly seats Sunday.

A survey released Friday by Merdeka Centre for Opinion Research showed the opposition People's Alliance ahead of the National Front, which has ruled for the past 56 years, by 1 percentage point.

The survey, conducted between April 28 and May 2 with 1,600 voters, indicated the ruling coalition would get a 85 parliamentary seat while the opposition will get 89 seats.

The remaining 46 seats were up for grabs.

- dpa