A hacker has taken over the computer system of the southern Spanish city of Jerez de la Frontera and is demanding a ransom paid in bitcoin to unlock it, local officials said Friday.
The cyber attack, which has caused outages of services offered through the city's website, began on Tuesday night, a municipal spokesman told AFP.
The hacker behind the attack is demanding a payment in bitcoin to restore the computer system, he added, without saying how much is being asked for. Bitcoin and other cryptocurrencies have long been a favourite ransom tender for cyber criminals thanks to the currencies' anonymous nature.
Spain's interior ministry has sent three computer experts to Jerez de la Frontera, a city of some 212,000 residents which is the home of sherry, to help the municipality resolve the cyber attack, the city's authorities said in a statement.
Its Socialist mayor, Mamem Sanchez, said the municipal website would only be back up and running when it is "100% secure".
While law enforcement and security experts say it is unwise to pay hackers, many organisations end up accepting ransom demands which often cost less than rebuilding computer systems.