Sri Lanka, Sept. 22 -- The EU's cyber security agency says criminals are using ransomware to cause chaos in airports around the world.

Several of Europe's busiest airports have spent the past few days trying to restore normal operations, after a cyber-attack on Friday disrupted their automatic check-in and boarding software.

The European Union Agency for Cybersecurity, ENISA, told the BBC on Monday that the malicious software was used to scramble automatic check-in systems.

"The type of ransomware has been identified. Law enforcement is involved to investigate," the agency said in a statement to news agency Reuters.

It's not known who is behind the attack, but criminal gangs often use ransomware to seriously disrupt their victims' sys...