According to one of the affected contractors, these restrictions have delayed multiple deliveries of cargo destined for U.S. troops, including goods necessary for the construction of new camps to meet the needs of the shifting military operations.

WSJ: Kabul's Tax Levies Raise Flags From U.S. Watchdog

Two RAF cargo planes have been sent - although one was delayed in France - and UK technical personnel have been sent to Mali to receive them.

BBC: Mali crisis: Situation 'serious concern' for UK

Officials had delayed revealing the discovery in the hope that someone would come to collect the cargo.

BBC: Hong Kong in huge cocaine seizure