The Constitution Court has asked police to increase security at its evidence room and around the court building while it reviews the electoral fraud case that could lead to the dissolution of five political parties.

Public prosecutors yesterday delivered 70 boxes of documents, containing more than 140,000 pages and filling up an entire room, to the court and police posted four officers to guard the evidence.

The case stems from the alleged bankrolling of small parties to contest the April 2 election. The ruling Thai Rak Thai Party and the opposition Democrat Party are among the five parties named in the lawsuit.

"The Office of the Attorney General [OAG] has filed five reports, one for each party, detailing how the five respective parties were involved in the fraud," OAG spokesman Attapol Yaisawang said.

Charges against the five parties were endorsed by the Election Commission [EC] and public prosecutors had reconstructed how the violations took place, Attapol said.

He refused to release the five reports, saying it was for the court to decide whether to allow public access to the evidence.

Court secretary-general Paiboon Warahapaitoon said he was not authorised to comment on the case other than stating that the prosecution report on the ruling party contained 1,900 pages, and the report on the Democrats 1,500 pages.

The reports on Thai Ground and Pattana Chart Thai parties had 1,000 pages each and that on the Progressive Democratic Party contained 500 pages, he said.

Constitution Court acting President Parn Jantaraparn said the court would acknowledge the filing of the case next Thursday and rule the following week on whether to accept it for judicial review.

Parn said a fresh election could be held on October 15 as scheduled regardless of whether or not the court reaches a verdict by then.

Democrat chief adviser Chuan Leekpai said his party was not worried because it had not committed any wrongdoing.

"The Election Commission threatened to prosecute the Democrats for crying foul against the ruling party even before starting an investigation," he said.

He said he would not form a new party as a contingency in case of dissolution, expressing confidence that the party would survive.

Democrat executive Thaworn Senniam said his party was not involved in the alleged violations.