First Daughter Barbara Bush had her purse and cell phone stolen as she had dinner in a restaurant in Buenos Aires, Argentina, even though she was being guarded by a detail of Secret Service agents, according to law enforcement reports made available to ABC News. It was not the only mishap on the two-week trip to Argentina by Barbara (right) and her twin sister Jenna (left). A Secret Service agent on the advance detail got into an "altercation" with someone after a night out and was badly beaten, according to the law enforcement reports. The Secret Service said today the incident was an attempted mugging that occurred while the agent was on his own time. The agent is doing fine. The purse snatching took place on Barbara’s first night in town while she was dining in the picturesque San Telmo neighborhood. According to the reports, the Secret Service agents failed to notice the incident. The Secret Service would not comment on the purse snatching, and the First Lady’s office said they would not comment on any personal trip made by the daughters. There have been recent reports, however, that Jenna Bush has been living and working in Panama as an intern for UNICEF.