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Liverpool are investigating Welsh youth player Jordan Williams for allegedly mocking the Munich air disaster on Twitter during last night's Europa League tie with Manchester United.

Responding to a video of Liverpool fans celebrating at Old Trafford, the tweet sent from the 20-year-old academy graduate's social media account showed an aeroplane emoji and a pair of hands clapping.

It is understood the club are aware of the allegations but have not commented publicly.

The tweet was swiftly removed and Williams quickly apologised, saying he had been hacked and he has since deactivated his account.

"My Twitter has been hacked, I would never put anything like that to offend anyone, sorry about this," he wrote.

In 1958, eight United players were among 23 passengers who died in a crash on a snowy afternoon at Munich airport.

The tie had been surrounded by an unpleasant atmosphere after Manchester United fans were condemned by their own club following reports of 'sickening' chants mocking the Hillsborough disaster - where 96 Liverpool fans died.

Related:Who is Jordan Williams?

(Image: Getty Images)

Then, before last night's second leg, Liverpool supporters travelling to Manchester were greeted with a banner with the word 'Murderers' on and the date of the Hillsborough disaster tied to a bridge over the M602 in Salford.

In the closing minutes of the game a minor scuffle broke out in the top tier of the East Stand when a handful of Liverpool fans, sat among home supporters, unfurled a club flag but stewards moved in swiftly to isolate the group to prevent a further escalation after a few punches were aimed at them by home fans.