WASHINGTON — An Internal Revenue Service supervisor in Washington says she was personally involved in scrutinizing some of the earliest applications from tea party groups seeking tax-exempt status, including some requests that languished for more than a year without action.

Holly Paz, who until recently was a top deputy in the division that handles applications for tax-exempt status, told congressional investigators she reviewed 20 to 30 applications. Her assertion contradicts initial claims by the agency that a small group of agents working in an office in Cincinnati was solely responsible for mishandling the applications.

Paz, however, provided no evidence that senior IRS officials ordered agents to target conservative groups or that anyone in the Obama administration outside the IRS was involved.

Instead, Paz described an agency in which IRS supervisors in Washington worked closely with agents in the field but didn’t fully understand what those agents were doing. Paz said agents in Cincinnati openly talked about handling “tea party” cases, but she thought the term was merely shorthand for all applications from groups that were politically active — conservative and liberal.

Paz said dozens of tea party applications sat untouched for more than a year while field agents waited for guidance from Washington on how to handle them. At the time, she said, Washington officials thought the agents in Cincinnati were processing the cases.

Paz was among the first IRS employees to be interviewed as part of a joint investigation by the House Oversight and Government Reform Committee and the House Ways and Means Committee.

Congressional investigators have interviewed at least six IRS employees as part of their inquiry. The Associated Press has reviewed transcripts from three interviews — with Paz and with two agents, Gary Muthert and Elizabeth Hofacre, from the Cincinnati office.

The IRS declined comment for this story.

A yearlong audit by the agency’s inspector general found that IRS agents had improperly targeted conservative political groups for additional and sometimes onerous scrutiny when those groups applied for tax-exempt status.

The audit found no evidence that Washington officials ordered or authorized the targeting. But the IRS watchdog blamed ineffective management by senior IRS officials for allowing it to continue for nearly two years during the 2010 and 2012 elections.

Since the revelations became public last month, much of the agency’s leadership has been replaced and the Justice Department has started a criminal investigation. Both Paz and her supervisor, Lois Lerner, who headed the division that handles applications for tax-exempt status, have been replaced.

Agency officials told congressional aides that Lerner was placed on administrative leave. They did not disclose the status of Paz, other than to say she was replaced June 7.

Lerner is the IRS official who first disclosed the targeting, at a legal conference May 10. That day, she told The Associated Press: “It’s the line people that did it without talking to managers. They’re IRS workers; they’re revenue agents.”

On May 22 — the day after Paz was interviewed by investigators — Lerner refused to answer questions from lawmakers at a congressional hearing, citing her Fifth Amendment right not to incriminate herself.

Paz told congressional investigators that an IRS agent in Cincinnati flagged the first tea party case in February 2010. The agent forwarded the application to a manager because it appeared to be politically sensitive, Paz said. The manager informed Paz, who said she had the application assigned to a legal expert in Washington.

At the time, Paz headed a technical unit in Washington that provided guidance to agents who screened applications for tax-exempt status. The agents worked primarily in Cincinnati. One of their tasks was to determine the applicant groups’ level of political activity.

IRS regulations say tax-exempt social welfare organizations may engage in some political activity but their primary mission cannot be influencing the outcome of elections. It is up to the IRS to make that determination.

“It’s very fact-and-circumstance intensive. So it’s a difficult issue,” Paz told investigators.

“Oftentimes what we will do, and what we did here, is we’ll transfer it to (the technical unit), get someone who’s well-versed on that area of the law working the case so they can see what the issues are,” Paz said.