Melissa Korn and Jennifer Levitz :

U.S. prosecutors charged an additional mother in the college-admissions cheating case, alleging she paid $400,000 to get her son into UCLA and marking the 52nd person to face criminal prosecution in the sprawling scheme.

The woman, a Chinese national named Xiaoning Sui, was arrested Monday night in Spain and is being held there as U.S. authorities seek her extradition to Boston.

The indictment, unsealed Tuesday in Boston federal court, also introduces another individual allegedly involved in the scheme: a tennis recruiter who connected high-school players to college coaches and, according to prosecutors, worked with college counselor William “Rick” Singer to help bribe a University of California, Los Angeles soccer coach to secure admission for Ms. Sui’s son as a fake soccer player.