Washington (AFP) - US authorities created a secret database of journalists and activists linked to a caravan of Central Americans who tried to enter the US last year from Mexico, NBC reported. In some cases authorities flagged their passports for alerts, said the San Diego, California affiliate of NBC. It cited documents leaked to it by a source in the Department of Homeland Security who requested not to be named. It said these documents list people who officials thought should be screened at the US-Mexico border. They included 10 journalists, seven of them US citizens, an American lawyer and 47...