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One of the Celtic fans filmed singing about murdered soldier Lee Rigby has been identified as the son of an Irish Republican sent a nail bomb in the post.

Aidan McAdam, 23, sang "F*** Lee Rigby, he isn't f****** drumming any more" in the sickening clip.

The disgraceful video was filmed in the streets of Sunderland, where Celtic were playing a friendly match against the Championship side last weekend.

McAdam, from Coatbridge, has been vilified on social media by fellow Celtic fans and supporters of other clubs.

And today, the Daily Record has revealed that he is the son of Francis McAdam, 51, who worked at Republican group Cairde na hEireann's shop in Glasgow when a nail bomb was sent there twice in 2012.

(Image: Collect)

The Gallowgate store was closed both times and the package was sent to a depot in Belfast, where the alarm was raised.

The viable device was similar to nail bombs sent to Celtic boss Neil Lennon, his lawyer Paul McBride and Celtic fan Trish Godman MSP.

McAdam snr told the Record at the time: "We were expecting a batch of badges but the police told us in no uncertain terms that it was a viable device.

"Someone could easily have been seriously injured or killed.

"It is designed to frighten people, as well as to maim and kill, but it will not stop us campaigning against anti-Irish racism.

Last night, McAdam snr said he had no idea about his son's involvement in the sick video.

The clip lasts less than a minute and shows men - some wearing Celtic jerseys - walking down a street singing the offensive song.

(Image: Daily Record)

Lee's heartbroken mum told the Scottish Sun : “I haven’t stopped crying since I saw that video.

She said: “Celtic need to denounce these scum wearing their team’s shirt and apologise for what they have done.

“Lee never did anything to hurt them but they forget he was flesh and blood, my only son.

"He’s not just a news story or a name to be bandied about in spite.”

The video has also provoked a huge social media backlash.

(Image: MEN)

One user tweeted:”These are the #Celtic scumbags who sang sickening songs glorifying the death of Lee Rigby.

“Who are they? SHARE!”

Another said: “They do not represent the true fans. These are just thugs.”

A third posted: “Hope they are named and shamed. They are not doing this in my club’s name.”

Fusilier Rigby, 25, a drummer and machine-gunner, was murdered by Islamist fanatics Michael Adebolajo and Michael Adebowale outside Woolwich barracks in 2013.