WASHINGTON – Documents released by U.S. regulators Tuesday confirmed that Pfizer and BioNTech’s COVID-19 vaccine was strongly protective against COVID-19 -- offering the world’s first detailed look at the evidence behind the shots.The Food and Drug Administration posted its analysis online even as across the Atlantic, Britain on Tuesday began vaccinating its oldest citizens with the Pfizer-BioNTech shots.[TRENDING: This woman received the first COVID-19 vaccine | Judge scolds theme park trespasser | Chuck Yeager dies at 97]But the U.S.