The police were informed yesterday about the incident.
During inquiry, the alleged involvement of Murray Denis Ward, a British national and a frequent visitor to the institute, came to the light, the police said, adding that Ward had been associated with NAB as a regular donor for almost nine years.
Ward, who was subsequently arrested, allegedly sexually harassed the three NAB inmates on September 2, the police said.
Ward, a native of Gloucestershire, United Kingdom, was working with Sterlite Technology Limited in Gurgaon till April.
He had suffered a paralytic attack in February and has been under treatment since then.
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