An illegal immigrant with a forged passport was found working in the House of Commons.
The unnamed woman was arrested on 2 January 2015. She is believed to come from Sierra Leone and to have worked in the catering department for two months. She was supplied by an external agency.
Her status as a casual worker meant that she should have been accompanied at all times while on the Parliamentary estate, but she was able to roam freely in reality.
The matter was treated as a serious lapse of security.