Following the spill, the company was ordered by regulators to inspect the 35 kilometres (22 mi) of pipelines in Prudhoe Bay using "smart pigs".[119] In late July 2006, the "smart pigs" monitoring the pipelines found 16 places where corrosion had thinned pipeline walls. A BP crew sent to inspect the pipe in early August discovered a leak and small spill,[119][120] following which, BP announced that the eastern portion of the Alaskan field would be shut down for repairs on the pipeline,[120][121] with approval from the Department of Transportation.