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Up to 120 people have left Ireland to fight for ISIS, it is understood.

Earlier this month, Dubliner Khalid Kelly was blown up in Iraq, but it is believed many more people have left these shores to join the terror group.

It was reported in 2014 that up to 40 Irish citizens were fighting for ISIS in Iraq or Syria but that number could now be three times higher.

(Image: Irish Mirror)

A security source told The Irish Daily Star: "The 40 radicals are just the ones we are sure of, but it is believed it could be double if not triple that number.

"If you hold an Irish passport and travel by air or sea, they can lose track of you pretty quickly. Many of these people are crossing borders into Syria unnoticed."