WASHINGTON - The US Secret Service plans to dismiss two more agents in connection with alleged misconduct with prostitutes in Colombia last week before President Barack Obama's trip there, a government source said on Friday.

"It's been indicated to us that there are two agents that today are going to be told that the Secret Service intends to begin termination proceedings against them," the source told Reuters, asking not to be named.

The planned dismissals would follow the departure of three other Secret Service employees on Wednesday because of the scandal. It involved a night of partying from April 11-12 that embarrassed the United States and overshadowed Obama's participation in the Summit of the Americas last weekend.

Eleven Secret Service agents were linked to the scandal, in which at least 21 women were brought back to a beachfront hotel. The Pentagon said on Friday that 11 military personnel were under investigation in the episode, one more than previously reported.

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