LONDON (Reuters) -U.S. stock index futures pared some declines on Friday after data showed inflation in the world's largest economy cooled slightly last month, while European shares came under fire after Donald Trump's latest threat to impose tariffs. U.S. Treasury yields also fell, with the benchmark 10-year yield sliding 6.6 basis points (bps) to 4.504%. U.S. stock futures were down 0.6-0.8%, indicating Wall Street was set to open lower, but that compared to declines of 0.8-1.3% earlier in the day.