In this Wednesday, June 6, 2012, photo, a Pakistani man cleans the roof of an oil tanker that was used to transport NATO fuel supplies to Afghanistan, and parked with other tankers in a compound in Karachi, Pakistan. (AP Photo/Fareed Khan)

Photo by: Fareed Khan

In this Wednesday, June 6, 2012, photo, a Pakistani man cleans the roof of an oil tanker that was used to transport NATO fuel supplies to Afghanistan, and parked with other tankers in a compound in Karachi, Pakistan. (AP Photo/Fareed Khan)