The State Department is fighting new allegations it covered up sex scandals during Secretary of State Hillary Clinton's tenure.
A former State Department investigator leaked an internal memo, blaming senior officials for interfering in the investigations.
One allegation says a U.S. ambassador often "ditched his security detail" to solicit sexual favors in a park near the embassy.
The memo also alleges three of Clinton's security agents solicited prostitutes while on official trips.
In a Tuesday news conference, State Department spokeswoman Jen Psaki told reporters the agency takes "every allegation of misconduct seriously, and we investigate them thoroughly."
Psaki also balked at claims the problem is endemic.
"Last year alone, the detail accompanied Secretary Clinton to 69 countries with more than 10,000 person-nights spent in hotels abroad," Psaki said. "So, I am not going to speak to specific cases as I said at the onset, for obvious reasons, but it is hardly endemic."
The State Department argues the cases were all investigated and the agents were cleared or punished.