Police stand guard at the entrance to the US Air Force base at RAF Mildenhall, Suffolk, yesterday. US military personnel yesterday fired shots as they stopped a man who tried to force his way into the base. A security source, however, said it was not thought to be a terrorism incident. “Shots were fired by American service personnel and a man has been detained with cuts and bruises and taken into custody,” Suffolk police said. “No other people have been injured as a result of the incident.”