WASHINGTON Ash Carter, who until January was U.S. defense secretary, said on Tuesday he did not see major changes in the campaign against Islamic State since President Donald Trump took office, amid accusations the U.S. military may be relaxing rules protecting civilians. "I don't see overall major changes and I certainly hope they stay on the path that we set because I think that's the right path," Carter said at a forum at Harvard University, in his first public address since leaving the post. Carter declined to speculate about the investigation into an explosion in Mosul believed to have killed scores of civilians, even as he stressed the importance of probes of such incidents. The U.S. military has acknowledged a possible role in the incident but also says Islamic State could be to blame. (Reporting by Phil Stewart and Idrees Ali; Editing by Bill Trott) Next In World News GENEVA United Nations human rights experts called on Russia on Wednesday to release peaceful protesters arrested across the country at the weekend and to annul any sentences already handed down.MOSCOW Russian high school student Roman Shingarkin had some explaining to do when he got home after becoming one of the faces of anti-Kremlin protests at the weekend. His father is a former member of parliament who supports President Vladimir Putin.