A U.S. lawmaker says a "significant number" of Secret Service agents involved in an alleged prostitution scandal at an international summit brought women back to their hotel rooms before President Barack Obama arrived in Colombia.

U.S. Rep. Peter King, who was briefed Saturday on the investigation, tells The Associated Press that "close to" all 11 of the agents involved had women in the rooms at their hotel, which was separate from the one where Obama is now staying.

The New York Republican says the women were "presumed to be prostitutes," but investigators are interviewing the agents. King heads the House Homeland Security Committee.

The AP had earlier confirmed that agents had been sent home because of misconduct involving prostitutes. Initial reports said 12 agents were involved.

Now there's word from the U.S. military that five service members are accused of misconduct at the same hotel as the Secret Service agents.

(Copyright 2012 by The Associated Press.  All Rights Reserved.)