Criminals obtain firearms from a variety of sources. Registered firearms dealers, including repairers, retailers and those who provide storage and warehousing, may be corrupted, coerced or duped into providing criminals with weapons and ammunition. Police and HM Customs and Excise investigators have uncovered a number of instances where prohibited firearms and ammunition that have been legally purchased and imported by registered firearms dealers have found their way into criminal hands. Where the registered dealer has acted corruptly this has involved manipulating records to hide the diversion of firearms or ammunition; producing duplicate paperwork to allow the cloning of weapons; receiving shipments from suppliers that contain additional firearms not shown on the manifest; and 'losing' firearms between import and export.