Riots at the US Capitol Building. Michael Nigro/Pacific Press:LightRocket/Getty Ex-Houston officer Tam Pham allegedly told federal investigators he didn't enter the US Capitol. When pressed, he changed his story and said he joined rioters on January 6 to view 'historical art.' Insider created a searchable database of those individuals charged for their participation in the riot. Visit Business Insider's homepage for more stories. Tam Pham, the ex-Houston police officer charged in the January 6 attempted insurrection at the US Capitol, allegedly changed his story several times before fessing up to federal authorities, according to court documents.First, he said he was traveling to Washington, DC, for business and went to Trump's rally spontaneously, and then said he did not enter the Capitol.