The Public Security Police (PSP) seized more than eight tonnes (8,650 kg) of ammonium nitrate due to the storage of nitrates in quantities exceeding the permitted limit without the required licence issued by the PSP, and for storing restricted explosive precursors outside of restricted areas inaccessible to the public, as part of Operation 'Explosives Precursors'. According to a statement sent by the PSP to newsrooms, the operation was carried out between 2 and 6 March, within the scope of its exclusive and specific duties regarding the licensing, control, and inspection of the manufacture, storage, marketing, use, and transport of weapons, ammunition, explosive products, hazardous materials, and explosive precursors. 154 inspection actions were carried out on economic operators who provide explosive precursors and professional users to prevent criminal offences associated with this activity. The operation is linked to the European Day of Remembrance for Victims of Terrorism (established by the European Union), marked annually on 11 March following the terrorist attacks carried out with explosives at Atocha station in Madrid on 11 March 2004, which resulted in 193 deaths and around 2,000 injuries. Of the more than 150 inspection actions, 34 administrative offence notices were issued for various reasons, including 21 for lack of records or irregular registration of transactions, acquisitions, or manufacturing; eight for irregular storage; two for non-compliance with technical standards defined for the activity; and three for making restricted explosive precursors available to private individuals.