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Cartagena, COLOMBIA -- At least a dozen Secret Service agents covering President Obama in Colombia for a leaders summit were sent back to the United States because of allegations involving prostitution, Fox News' Ed Henry confirms through a senior law enforcement official.

The source says that the situation got serious enough that diplomats were brought in to mediate and the Secret Service agents were expelled from the country.

A new crew of agents were rushed into the country to help cover, and officials stress the president was not in any danger.

Of those sent home, it was not immediately clear if all of the agents were involved in prostitution or just associated with incidents surrounding it.