US President Barack Obama said he expected a “rigorous” investigation into a sex scandal involving Secret Service agents, warning he would be “angry” if the claims were proven true. The incident, which saw 11 Secret Service and five military personnel pulled from their security duties in Colombia at the Summit of the Americas, overshadowed the talks attended by Obama and other regional leaders. The US Secret Service, which has sent the men back to the United States, is investigating claims they brought prostitutes to their hotel rooms in Cartagena late Wednesday and had a dispute over payment with one of the women. “I expect the investigation to be thorough and rigorous,” Obama said Sunday at a press conference with Colombian President Juan Manuel Santos at the end of the summit. “If it turns out the allegations that have been made in the press are confirmed, then of course I'll be angry.” The military is conducting a separate probe and has confined the service members involved to their barracks. None of the Secret Service personnel involved – both agents and uniformed officers – was assigned to Obama's personal security detail. But Obama, who is facing a tough reelection battle in November, stressed that all members of his __
