After 50 people, including parents and coaches, were charged last month with crimes, the nation’s largest-ever college admissions prosecution appeared to be ensnaring another group — students.

According to a lawyer involved in the case, at least some children of the parents who were charged in the scandal have received so-called target letters, which notify people that they could be targets of a criminal probe. The lawyer declined to be quoted by name, citing sensitivities about the ongoing case. A spokeswoman for the federal prosecutor’s office in Boston, which is handling the case, declined to comment on the development, which was previously reported in Law360, a legal news service, and The Wall Street Journal.

It was uncertain on Monday how many students received such target letters or whether they would, in fact, lead to additional charges. Several defense lawyers in the case said the children of their clients — parents charged with trying to get their children admitted to college with falsified athletic credentials or altered test scores — had not received such letters.