The packages that were opened on Gibraltar's border with Spain were not diplomatic bags, Spain's Foreign Minister said.
Jose Garcia-Margallo reportedly told the BBC: "There is no incident. If it is not a diplomatic bag, there is no diplomatic incident. A bag was opened, which was not a diplomatic bag."
A Foreign Office spokesman said the bags were "clearly marked as the property of HM Government" and, as such, were covered by the Vienna Convention.
More top news
Tomorrow will be dry at large with spells of sunshine for most areas.
ITV News has witnessed first-hand the ferocious battle for Mosul travelling with Iraqi special forces as they came under constant attack.
Karena Virginia claims Mr Trump made lewd comments and touched her breast at the US Open in 1998.