Shares of AT&T Inc fell more than 5% to hit their lowest level in thirty years on Monday, after analysts downgraded the stock following a news report that the telecommunications giant left toxic lead cables buried across the United States. A Wall Street Journal report on July 9 named AT&T and Verizon among several telecom giants that abandoned a sprawling network of underground toxic lead cables, with a huge number of them possibly contaminating neighboring soil and drinking water sources. Analysts at Citigroup and JPMorgan both lowered their recommendations on AT&T shares in recent days.