KABUL, Afghanistan—A searing blaze that roared through dozens of fuel tankers on the northern edge of the Afghan capital of Kabul killed seven people and injured 14 others, the Interior Ministry said Sunday. Investigators were combing through the tankers that lay in smoldering ruins and a gas station caught in the flames that lit up the area late Saturday, said ministry spokesman Tariq Arian. There was no immediate indication of whether it was an accident or sabotage. It came on the same day the United States and NATO officially began the final phase of a withdrawal from Afghanistan, ending a nearly 20-year military engagement. All 2,500-3,500 American soldiers and about 7,000 NATO allied forces will be out of Afghanistan at the latest by Sept. 11, the 20th anniversary of the terrorist attacks in the United States that first brought them into the country. Arian said the fire began when a …