Investigators, who are still in the early stages of their probe, have not uncovered any direct evidence that senior officials in Washington ordered the agents to target tea party groups, or why they may have done so.
But two agents in the IRS's Cincinnati office say they believe their work was being closely monitored by higher-ups in Washington. One agent, Elizabeth Hofacre, complained to investigators that she was being micromanaged by Washington when she processed applications for tax-exempt status by tea party groups, according to a transcript of her interview with investigators.
Her interview suggests a long trail of emails that could support her claim.
"It was demeaning," Hofacre said. "One of the criteria is to work independently and do research and make decisions based on your experience and education, whereas on this case, I had no autonomy at all through the process."
The revelation could prove to be significant if investigators are able to show that Washington officials were involved in singling out tea party and other conservative groups for extra scrutiny when they applied for tax-exempt status. IRS officials have said repeatedly that the targeting was initiated by front-line agents in the Cincinnati office and was stopped once senior officials in Washington found out.
A yearlong audit by the agency's inspector general found no evidence that Washington officials ordered or authorized the targeting. However, the inspector general blamed ineffective management by senior IRS officials for allowing the targeting to continue for nearly two years during the 2010 and 2012 elections.
In the latest IRS personnel move in the wake of the episode, the agency has replaced one official who helped oversee the workers who process applications from groups seeking tax-exempt status.
An internal IRS announcement said Friday that Karen Schiller will have that job starting Monday. Until now that post has been held by Holly Paz.
According to House Oversight and Government Reform Committee Chairman Darrell Issa, R-Calif., Paz was involved in an internal IRS investigation that in May 2012 essentially concluded that the agency had been targeting conservative groups. That was a year before the IRS revealed the targeting publicly.
Paz has been a top deputy to Lois Lerner, a Washington official who oversaw the Cincinnati IRS division that processed conservative groups' applications.
Friday's announcement did not address Paz's status. Since President Barack Obama made Danny Werfel the new IRS chief last month, some IRS workers have been put on administrative leave, including Lerner.
Three congressional committees and the Justice Department are also investigating. Investigators for the House Oversight and Government Reform Committee and the House Ways and Means Committee have interviewed at least four IRS workers as part of their probe, including Paz.
The Associated Press viewed transcripts of interviews with two IRS agents working in the Cincinnati office.
Gary Muthert, an IRS agent there, said his local supervisor told him in March 2010 to check the applications for tax-exempt status to see how many were from groups with "tea party" in their names. The supervisor's name was blacked out in the transcript.
"He told me that Washington, D.C., wanted some cases," Muthert said of his supervisor.
Muthert said he came up with fewer than 10 applications. But after checking some of the group's websites, he noticed similar groups with "patriots" or "9-12 project" in their names, so he started looking for applications that mentioned those terms too.
Over a two-month period, Muthert said he found about 40 applications that mentioned tea party, patriots or 9-12 project — the latter being groups that aspire to re-instil a post-9-11 spirit of unity in the country.
Muthert said his supervisor told him that someone in Washington wanted to see seven of the applications, so Muthert prepared the files.
Muthert did not respond to multiple requests by the AP for comment.
The IRS was screening the groups' applications because agents were trying to determine their level of political activity. IRS regulations say tax-exempt social welfare organizations may engage in some political activity but the activity may not be their primary mission. It is up to the IRS to make that determination.
Then-Commissioner Doug Shulman and Steven Miller, who was a top deputy at the time, told Congress that they didn't learn about tea party groups being targeted until the spring of 2012. They said they didn't come forward publicly until this year because the agency's inspector general was investigating the matter.
The inspector general's report said Lerner, who headed the IRS division that oversees tax exempt organizations, had been briefed on the targeting in June 2011. She ordered the initial tea party criteria to be scrapped, but it later evolved to include groups that promoted the Constitution and the Bill of Rights, the report said.
Lerner is the IRS official who first publicly disclosed the targeting at a legal conference in Washington on May 10.
Hofacre, who also works in the Cincinnati office, told investigators she was in charge of processing applications from tea party groups — once they were selected by other agents — from April 2010 to October 2010. Hofacre said her supervisor in Cincinnati, whose name was blacked out in the transcript, told her to handle the applications.
But, she said, an IRS lawyer in Washington, Carter Hull, micromanaged her work and ultimately delayed the processing of applications by tea party groups.
Neither Hofacre nor Hull responded to requests for comment.
Associated Press writer Alan Fram contributed to this report.
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