Two shareholder suits have now been filed against AT&T in the District of Delaware, alleging directors and officers shielded investors from the company’s involvement with leaving lead-covered cables around the country.

The latest lawsuit was filed Jan. 22 by Rigrodsky Law and the Rosen Law Firm, joining an existing derivative suit filed Jan. 11 by Farnan LLP and the Brown Law Firm. It’s the latest wave of litigation blowback against telecommunications companies that were linked to toxic underground cables and their effects in a series of stories released in July by the Wall Street Journal.