WASHINGTON (Reuters) - A prostitution scandal in Colombia involving U.S. Secret Service employees did not result in any security breach and was not behavior that reflected the high ethical standards of the agency, the director of the agency said. Secret Service Director Mark Sullivan defended the culture of the agency in testimony prepared for a Senate hearing on Wednesday, saying its employees were among the most dedicated and "self-sacrificing" in the federal government. It will be his first public appearance before Congress since the scandal. ...

CHICAGO (Reuters) - The NATO summit ended without major violence between police and protesters, winning praise for Chicago Police Chief Garry McCarthy and helping erase bad memories of the bloody street battles here during the 1968 Democratic convention. Ever since anti-Vietnam protesters were beaten in what a commission later called a "police riot" in 1968, Chicago has tried to live down its reputation for police brutality. ...

(Reuters) - An estimated 5,000 people participated on Tuesday in a "walk of unity" to Joplin, Missouri, along the path of a deadly tornado that tore through the city one year ago, killing 161 people. The anniversary of the tragedy also was marked by President Barack Obama, who traveled to Joplin to give the commencement address for graduating high school seniors whose school building was obliterated by the EF-5 tornado, the strongest on a rating scale for twisters. "Just as you have learned the goodness of people, so have you learned the power of community," Obama said. ...

WASHINGTON (Reuters) - The Obama administration arranged for two Hollywood filmmakers to get special access to government officials involved in the commando operation that killed Osama bin Laden, according to a conservative legal group that posted internal government documents on its website Tuesday. Judicial Watch posted what it said were 153 pages of Pentagon documents and 113 pages of CIA documents about the film project. ...