Cyberattacks on computers that run the nation's energy grid, nuclear reactors and water treatment plants are increasing, with potentially lethal effects, according to the Department of Homeland Security's top investigator, Bloomberg reported.

Successful infiltrations of computer networks have the potential to create large-scale power outages or cause "physical damage, loss of life and other cascading effects that could disrupt services," Charles Edwards, the agency's acting inspector general, said in prepared testimony for a congressional hearing today. Read more.