The U.S. Justice Department has notified Deutsche Bank that the German bank may have violated an earlier out-of-court agreement by failing to inform authorities about a complaint about the work of its ESG investment unit, The Wall Street Journal reported, citing informed sources. The complaint concerned the extent to which the DWS Group unit used environmental criteria in its asset management.

U.S. regulators learned about it from an October WSJ article, not from the bank itself. Meanwhile, under the terms of a deal with the authorities struck in January, Deutsche Bank pledged to disclose important information and meet other stringent requirements. Breach of obligations could lead to termination of the agreement and, at worst, criminal charges.

In January, Deutsche Bank settled U.S. authorities’ claims of foreign corruption and market manipulation by paying a $130 million fine in exchange for dropping criminal charges. Under the terms of the agreement, the bank needs to stay out of the regulators’ sights for several years and report any problems that arise. A spokesman for the bank as well as the U.S. Justice Department declined WSJ’s request for comment. Deutsche Bank shares are getting cheaper in Frankfurt trading. Since the beginning of the year, the bank’s capitalization has grown by a quarter to 23.51 billion euros.