Internal Revenue Service officials in Washington and at least two other offices were involved in the targeting of conservative groups seeking tax-exempt status, making clear that the effort reached well beyond the branch in Cincinnati that was initially blamed, according to documents obtained by The Washington Post.

IRS officials at the agency's Washington headquarters sent queries to conservative groups asking about their donors and other aspects of their operations, while officials in the El Monte and Laguna Niguel offices in California sent similar questionnaires to tea party-affiliated groups.

IRS employees in Cincinnati also told conservatives seeking the status of "social welfare" groups that a task force in Washington was overseeing their applications, according to interviews with the activists.