The National Library (NK) in Prague announced yesterday that it has been the victim of a cyberattack and has switched off its key systems. Experts are now working on the safe resumption of its operation but the library will remain closed to the public until further notice. NK management has filed a criminal complaint about the unidentified perpetrator over the attack. In the meantime, the borrowed books can be returned to the book-box within the Klementinum complex. A spokesperson said that some digital databases are still working. At present, the NK records about 30,000 readers. The NK is one of the oldest Czech public libraries, administering the biggest book collection in the country. It is located in Klementinum, reporting to the Culture Ministry. The NK is the center of the library system, administering the collection of historical and modern literature with over six million documents. Annually, another roughly 70,000 titles are added to the collection. There are over 16,000 manuscripts such as the priceless Vysehradsky kodex (Codex Vyssegradensis in Latin, aka Coronation Gospels of King Vratislaus) from 1086. According to the security firm Check Point, the number of hackers' attacks surged by 259 percent since the start of the year. ČTK