Hundreds of official documents have been found scattered on a street in part of Nottingham.
The documents were found on a street in Nottingham
Many of the documents, which were found on Derby Road, contain sensitive information and had been stamped by HM Revenue and Customs (HMRC).
One gives details of the training of a customs officer, including details of interviews with passengers suspected of smuggling cigarettes via an airport.
HMRC said it has reacted urgently and is currently investigating the matter.
The documents, found by a BBC reporter, included a VAT return of a man in Norwich which showed how much he paid for the November 2005 to May 2006 period and his name and address.
HMRC said the documents were being securely held by the city council and would be collected on Thursday.