US Senator Susan Collins has said that "twenty or 21 foreign national women" were brought to the hotel in Colombia by US Secret Service agents and US military, according to Reuters.
Ms Collins was briefed by Secret Service director Mark Sullivan who said that US marines were allegedly involved.
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Temperatures will reach around 28 Celsius (82F) at their highest.
A minute's silence will be observed at 11am on Thursday in remembrance of those who lost their lives in the Manchester Arena attack.
New research has found those who consumed two cups had a 35% reduced risk, and for those who drank five cups, the risk halved.