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Wally Santana, Associated Press
Supporters of Taiwan's opposition Democratic Progressive Party 2012 presidential candidate Tsai Ing-wen cheer her on as she travels through neighborhoods in Taipei County, Taiwan, Monday, Jan. 2, 2012. Taiwan will hold its presidential election on January 14, 2012.

TAIPEI, Taiwan — Taiwan's presidential campaign has taken a dark turn, with the opposition challenger accusing intelligence services under the control of incumbent President Ma Ying-jeou of tracking her campaign events for political advantage.

The allegations — unproven and denied by Ma — conjure up memories of Taiwan's unsavory one-party past, when Ma's party, the Nationalists, used their total control of the state apparatus to persecute opponents. While the island has since morphed into one of Asia's most dynamic democracies, many senior civil servants may still believe that serving the top political echelon involves cutting corners.

"Even if the president did not give an order for monitoring, the heads of intelligence were appointed by him, and they could take the elections as a good time to return the favors," the mass-circulation Apple Daily said in an editorial published Friday.

The Jan. 14 poll pits Ma, 61, against Tsai Ing-wen, 55, of the main opposition Democratic Progressive Party. Polls indicate an extremely tight race.

The allegations of intelligence service abuse were first raised last week by Taiwan's Next Magazine, which said National Security Council Secretary General Hu Wei-chen instructed Justice Ministry investigators to monitor Tsai's activities in May after she became a presidential candidate. Hu reports directly to Ma.

Next said the bureau reported back to a Hu subordinate last month with details of Tsai's campaign events and her meetings with political activists, including evaluations of how many votes they were likely to bring to Tsai should they support her.

It said the information was then passed onto Ma.

The magazine published names of 28 Justice Ministry officials it alleged were involved in monitoring Tsai, and printed a purported bureau

To buttress its claims the magazine published the names of 28 officials from the Justice Ministry's Investigations Bureau that it said were involved in monitoring Tsai, and reproduced a copy of a purported bureau memorandum with the political evaluations.

Tsai said Next's allegations raised questions about Ma's oft-repeated promise to keep Taiwan's intelligence services out of politics.

"In a democratic society if the president directs the intelligence services to monitor a rival's campaign, that would be a very serious matter," she said.

For his part Ma denied receiving any information on Tsai and insisted he was opposed to using state organs for political purposes.

"I detest this kind of snooping and will by no means allow it to happen," he said.

The National Security Council acknowledged last month's meeting with the Investigations Bureau, but denied that it received any campaign intelligence from Bureau officials, or that any such intelligence was passed to Ma.

The Investigations Bureau said that it followed the activities of presidential candidates in line with its mandate to provide them physical protection, but was in no way involved with collecting political intelligence.