FRESH elections would have to be held for all 20 Legislative Council directly elected seats if an election petition filed yesterday succeeds. The petition, filed by supporters of ex-legislator Dr Tang Siu-tong, urged the High Court to declare not only the election result in his New Territories Northwest constituency void, but also inquire into the results of the other 19 constituencies. Petitioner Chow Wing-kan said more than 110,000 voters were disqualified from the register before the poll under a questionable procedure. Mr Chow, an assistant to Dr Tang, said the omission of voters from the register had materially affected the result, especially in the New Territories Northwest constituency. At least 104 of the 1,100 de-registered voters in that constituency had declared themselves supporters of Dr Tang. Dr Tang lost to his opponent, Zachary Wong Wai-yin from the Democratic Party, by 57 votes. The petition also questioned polling and counting procedures. Dr Tang said the election had been unfair because a large number of voters had been stripped of their rights. The Boundary and Election Commission has said it abided by electoral laws when it removed electors' names from the register. The names were struck off only after repeated efforts to confirm their addresses failed, the commission said. It is not known when the hearing on the case will be. Another defeated candidate, Wong Sing-chi, will file an election petition today to try to overturn the result in the New Territories North constituency. Mr Wong, a Democratic Party member who lost by 48 votes, also questioned the de-listing of a large number of voters.