Their eldest daughter, Isabella Giannulli, 20, deleted her popular Instagram account late Wednesday just as reports surfaced that she received a formal letter from prosecutors that could lead to potential charges.

The Daily Mail reports that Loughlin’s daughter received a letter of intent from federal prosecutors in Massachusetts in early April as part of the ongoing Operation Varsity Blues investigation. Last week, the Wall Street Journal also reported that several students had received ‘target letters’ from federal investigators in cases where the student may have been complicit…

The Daily Mail, quoting an unnamed source, reported that Loughlin’s daughter had received a letter. “It is a not-so-veiled threat. [The U.S. Attorney’s Office for the District of Massachusetts] is making it pretty clear that they have evidence that very strongly suggests she knew of the illegal plot.”