The UK National Crime Agency (NCA) is examining accusations that an employee leaked information to a suspect in exchange for money, thereby resulting in the undermining of a probe into a network of insider trading suspects in Europe, the Wall Street Journal reported on Thursday.

The NCA, which usually focuses on tackling serious and organized crime, is investigating whether a government translator with access to wiretap recordings tipped off the target of an insider-trading investigation, the Journal reported, citing people familiar with the matter.

The NCA could not immediately be reached for comment.