CHICAGO — A newly unveiled indictment against former U.S. House Speaker Dennis Hastert accuses the Illinois Republican of agreeing to pay $3.5 million in hush money to keep a person from the town where he was a longtime high school teacher silent about “prior misconduct.” But it offers few hints about a central question: What was the alleged wrongdoing?

The concise federal grand jury indictment handed down Thursday accuses Hastert, who once was second in line to the U.S. presidency, of agreeing to pay the money to a person identified in the document only as “Individual A,” to “compensate for and conceal his prior misconduct against” that person.

It notes that Hastert, 73, was a high school teacher and coach from 1965 to 1981 in suburban Yorkville, about 50 miles west of Chicago. It goes on to say Individual A has been a resident of Yorkville, and has known Hastert most of Individual A’s life, but doesn’t describe their relationship.

Legal experts say the fact that federal prosecutors noted Hastert’s tenure in Yorkville in the indictment’s first few sentences strongly suggests some connection between the allegations and that time and place.

“Notice the teacher and coach language,” said Jeff Cramer, a former federal prosecutor and head of the Chicago office of the investigation firm Kroll. “Feds don’t put in language like that unless it’s relevant.”

The indictment charges Hastert with one count of evading bank regulations by withdrawing $952,000 in increments of less than $10,000 to skirt reporting requirements. He also is charged with one count of lying to the FBI about the reason for the unusual withdrawals.