They later returned to the five-star Hotel Caribe accompanied by a clutch of Colombian women.

BBC: Secret Service Colombia scandal prompts new rules

They are under investigation after preliminary findings revealed that they brought back several prostitutes to the Hotel Caribe in Cartagena, sources told CNN on Saturday.

CNN: STORY HIGHLIGHTS

Mr. King, who said he was briefed by the Secret Service, said it appears the Secret Service personnel brought women back to the Hotel Caribe Wednesday night.

WSJ: Secret Service Agents in Scandal Placed on Leave

According to sources, the alleged prostitutes -- the youngest of whom were in their early 20s -- signed in at Hotel Caribe in Cartagena, where Secret Service members apparently stayed.

CNN: Senators criticize military briefing on Colombia scandal

According to sources, the alleged prostitutes -- the youngest of whom were in their early 20s -- signed in at Hotel Caribe in Cartagena, where Secret Service members apparently stayed, flashing their local ID cards.

CNN: STORY HIGHLIGHTS

Twenty women believed to be prostitutes were discovered with American agents or troops at the beachfront Hotel Caribe after one of the men allegedly refused to pay a previously agreed price for sex, sparking a row.

BBC: Obama criticises 'knucklehead' sex scandal agents

While some of the service members had been together prior to returning to the hotel on April 11, they made "individual decisions" to bring the women back to the el Caribe Hotel and pay for sex, the report said.

CNN: Military report details misconduct on Colombia trip