Hackers attack computers across the world

Hackers carried out an attack on internet system that left computers in dozens of countries out of order.

The online chaos affected thousands of machines, affecting operations in government offices in Russia, Spain, and even Britain's National Health Services, interrupting medical procedures.

Europe, Latin America and parts of Asia were hit particularly hard. The attack is part of a growing menace called 'ransomware,' in which hackers deliver files to computers that automatically codify their data, making it unusable until a ransom is paid.

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