UPDATE 1-Venezuela's Amuay and Cardon refineries halted by blackout -sources

Venezuela's Amuay and Cardon refineries are halted following a blackout in the early morning hours, two oil industry sources with knowledge of the issue said on Sunday. The twin refineries together form the 955,000 barrel-per-day (bpd) Paraguana Refining Center, which has been operating well below capacity for years because of chronic operational problems that have been aggravated by Venezuela's economic crisis. "Blackout in both refineries," one employee who works in the complex wrote in a text message.