CARACAS (Reuters) - Venezuelan President Nicolas Maduro on Wednesday said the country’s Amuay oil refinery was victim of a terrorist attack on Tuesday that involved a “powerful weapon”, but said the country had gasoline reserves equivalent to 20 days of consumption. An explosion hit a distillation unit at the 645,000 barrel-per-day (bpd) plant on Tuesday, people familiar with the matter said, though there were no reports of injuries. The incident came while output at the plant was halted, though workers were attempting to restart some production. “Yesterday, the Amuay refinery - one of the most important refineries in Venezuela and Latin America - was attacked with a long, powerful weapon,” Maduro said at a press conference, adding that the government was seeking to determine what kind of weapon was involved. The OPEC nation’s once-formidable 1.3 million bpd refining network is mostly halted due to years of underinvestment and mismanagement, contributing this year to acute fuel shortages across Venezuela.