British Airways has confirmed they are experiencing a ‘global system outage’ (Picture: PA)

British Airways’ computer systems have gone down globally causing major delays at airports in the UK.

Passengers have taken to Twitter to say their flights have been left grounded and there are huge queues at check-in.

There are reports that hundreds of bags have reportedly been gathered and left unattended as BA staff try to take control of the situation.

One passenger tweeted: ‘Stuck on a British Airways plane at Belfast, going nowhere. ‘BA computers down worldwide’, whatever that means!’

@HeathrowAirport @British_Airways everyone's luggage bags being gathered and left unattaneded. Completely unsecure. — Miss John (@MissJohnMusic) May 27, 2017

Feel sorry for these guys, they've been on the plane for a couple of hours waiting to push back, due to the computer outage #T5 #heathrow pic.twitter.com/ugkg2tDd5o — Gareth Wharton (@theboyg) May 27, 2017

Another, Nadia Whittley, posted: ‘British airways computers down T5 and standstill, stranded on the plane and they make us pay for food!! Please retweet this indecency!’

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Julie Adie wrote: ‘We are on the runway.. For hour now..no offer of drinks..and because ba only takes cards now, we only have cash…wat we supposed to do!!??’

While another customer said he couldn’t log in to the app to fetch his boarding pass and had to miss his flight.

British Airways staff have reportedly started using flip charts to display flight information.

Stuck on a @British_Airways plane at Belfast going nowhere. “BA computers down worldwide” whatever that means! #britishairways — Philip Bloom (@PhilipBloom) May 27, 2017

Current situation @British_Airways??? No update. Whats going on? How long we stuck for? pic.twitter.com/U2Y58RdTXq — Sly Fox© (@thesuperslyfox) May 27, 2017

Terry Page, 28, who was booked on a BA flight to Texas, was stuck in a queue in Terminal 5 for two hours.

He claims BA ‘made no announcements at all’ about the delays, adding: ‘I tried to use their website to get a screenshot of my boarding pass – but the website isn’t working either.”

‘(We) had to rely on the whisperings I could hear from staff talking.’

@HeathrowAirport @MFranchitti @British_Airways Any news on this system crash? Waiting on the tarmac in Stockholm with no information. — Ilir Soleil (@ilirsoleil) May 27, 2017

He added: ‘We’ve tried all of the self check-in machines; none were working, apart from one. There was a huge queue for it and it later transpired that it didn’t actually work, but you didn’t discover that until you got to the front.’

‘Then we queued for about an hour and a half with lots of people pushing in front to catch earlier flights.’

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A spokeswoman for the airline confirmed the computer system outage and said: ‘We apologise to customers who are facing some delays following an IT outage this morning.

‘We are working to resolve the problem as quickly as possible.’

Metro.co.uk has contacted Heathrow airport and British Airways for comment.