Spain's Foreign Ministry says Gibraltar police has been involved in an unauthorised cross-border action in the southern Spanish town of San Roque.

Newspaper reports in Spain said two officers had entered a property in San Roque and seized objects related to a robbery in Gibraltar

The Ministry said in a statement Saturday that the Spanish government had made its “deep unease” known to Britain's ambassador and to the Gibraltar's Chief Minister.

The government of Gibraltar said in a statement on Saturday that it apologised to Spain for the regrettable and “incorrect action of two police agents.”

Spain ceded sovereignty of Gibraltar to Britain in 1713 but has persistently sought the tiny southern territory's return.

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