AIRPORT software is being held for ransom by criminals as travel chaos persists following a massive cyber attack .

The EU's cyber security agency says that malicious software is being used to hamper check-in services at major terminals.

It come as airports across Europe have been scrambling to resume normal service after Friday's attack.

Heathrow, Brussels and Berlin airports all faced major disruption in its wake.

The European Union Agency for Cybersecurity said: "The type of ransomware has been identified.

" Law enforcement is involved to investigate."

Internal crisis communications from Heathrow staff seen by the BBC asked airlines to use manual workarounds to get passengers boarded and checked-in.

Criminals can use ransomware to inflict damage on computing systems and dema

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