venezuela say their loved ones are paying with their lives. tonight, the u.s. now responding to claims from the venezuelan president that the u.s. could be behind the blackout. abc's tom llamas is in venezuela again tonight. >> reporter: tonight, venezuela's most needy trying to stay alive in hospitals just like this one, with little or no power. so, you can see, this is the situation here in some hospitals in caracas. there is no power. this is a private hospital, they do have a generator, but it's not enough power to power the entire floor at times, you can see patients are being wheeled out in the dark. this is the reality in venezuela. guiding us through this dark maze, the hospital's e.r. chief. the facility invited us in to see the desperation. parts of the hospital relying on a generator, but they have to conserve power, to keep patients like romero andrade alive. since the nationwide blackout six days ago, he's been in a coma, battling colon cancer. his daughter tells me they were treating him using flashlights.