Secret Service did not compromise security during Colombia prostitute scandal-probe

* Letter from Inspector General details events

* Six women paid, four others refused payment

* No threat to Obama's safety or security

WASHINGTON, Sept 21 (Reuters) - Thirteen employees of the

U.S. Secret Service were entangled in a prostitution scandal in

Colombia earlier this year but their actions did not compromise

the safety of the president, a Department of Homeland Security

investigation found.

In a letter to members of Congress obtained by Reuters on

Friday, acting Homeland Security Inspector General Charles

Edwards summarized his agency's findings after an investigation

into the biggest scandal to hit the Secret Service.

A dozen Secret Service employees were accused of misconduct

for bringing women, some of them prostitutes, back to their

hotel rooms in Colombia in April ahead of President Barack

Obama's visit to Cartagena. At least seven of the Secret Service

employees have left the agency since the scandal was uncovered.

"Although we found that these agents engaged in misconduct,

our investigation developed no evidence to suggest that the

actions of (U.S. Secret Service) personnel in Cartagena

compromised the safety and security of the president or any

sensitive information during this trip," Edwards wrote.

The letter was sent to the members of Congress in advance of

a briefing on the investigation. In his letter Edwards said his

office would not disclose the investigative report or discuss it

publicly.

Edwards said the Inspector General's office interviewed or

attempted to interview 251 Secret Service personnel and reviewed

travel records, hotel registries and cables as well as personnel

assignments and Secret Service and U.S. Embassy documents.

Based on the review and interviews, he said his office could

identify 13 Secret Service employees who "had personal

encounters" with Colombian women at two hotels and a private

residence.

Six of the women were paid by the Secret Service employees,

four asked for money but were not paid and three left the hotel

rooms without asking for money, Edwards said. Prostitution is

legal in Colombia.

One of the women who was paid was initially refused payment

but she brought a Colombian police officer to the door of the

Secret Service employee's room. When he did not answer the door,

a different Secret Service employee paid her, the letter said.

A hotel registry showed that a Defense Department employee

working with the White House Communication Agency and another

person possibly affiliated with the White House advance

operation also might have had contact with foreign nationals,

the letter said.

But a White House review concluded that no members of the

advance team engaged in inappropriate conduct during Obama's

trip to Colombia, a White House official said.

Senator Susan Collins, the top Republican on the Homeland

Security committee, said she was troubled about the different

conclusions on possible involvement by White House staff and

said it raised concerns about the credibility of the White House

investigation.

The U.S. military has completed a separate report about a

dozen U.S. military service members who brought Colombian women

to their hotel rooms in Cartagena. The military has said it was

not pursuing criminal charges against the service members but

was pursuing lesser punishments instead.

(Reporting by Susan Cornwell and Matt Spetalnick; Writing by

Deborah Charles; Editing by Lisa Shumaker)