The US Secret Service has said three more employees are resigning over the prostitution scandal that overshadowed a summit in Colombia last weekend.

Supervisors David Chaney and Greg Stokes are among three agents already leaving the elite agency in the wake of the affair.

US President Barack Obama was briefed on Friday by Secret Service Director Mark Sullivan about the scandal.

It broke as the president arrived for last weekend's Summit of the Americas.

On Friday, a 12th Secret Service employee was placed on administrative leave.

Another member of staff at the agency was cleared by investigators of "serious misconduct", but will face administrative action.

The scandal broke when a dispute between an escort and an agent spilled into the hallway of a beachfront hotel.

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http://www.bbc.co.uk/news/world-us-canada-17794267