(CNN) -- Only a fraction of the oil that normally courses through the Trans Alaska pipeline was flowing early Sunday after operators discovered a leak near Prudhoe Bay, a company spokeswoman said. Crews making a routine inspection "found oil in the basement of a booster pump building" around 9 a.m. Saturday, according to Aleyeska Pipeline Service Company spokeswoman Michelle Egan, who said flow has been reduced by 95%. On a typical day, 642,261 barrels of oil would pass through the pipeline. "Crews are currently onsite to assess the situation and isolate the source of the leak," a company statement said. CNN's Tom Laabs contributed to this report.
Flow in the Trans Alaska pipeline is reduced to 5% of normal . A leak is found in a booster pump building . Technicians are working on a fix for the leak .