A British extremist who fought to overturn Libya’s Moamer Kadhafi and later joined the ranks of the "Islamic State of Iraq and Syria" (ISIS) in Syria was sentenced to 10 years in prison Friday (December 8th), AFP reported.

Mohammed Abdallah, 26, who has dual British and Libyan nationality, joined the "Tripoli Brigade" in 2011 along with his brother, Abdalraouf.

Abdallah's brother was shot and paralysed from the waist down in battle, the trial in London heard.

In 2014, Abdallah headed to Syria with help from his wheelchair-bound brother, who set up a "hub" for would-be ISIS fighters from his home in Manchester.

He was arrested when he returned to London's Heathrow airport in September 2014.

In 2016, Sky News published files from an ISIS defector which listed Abdallah as a specialist sniper with expertise in using the "Dushka" -- a Russian-made heavy machine gun.

Abdallah was found guilty on Thursday of possessing a Kalashnikov assault rifle, receiving £2,000 ($2,700) for terrorism and membership of ISIS.

Abdallah denied pledging allegiance to ISIS. But judge Maura McGowan said Abdallah had "bragged" about acquiring weapons and was "totally committed" to signing up with ISIS.

"Your commitment to violence abroad is clear and you have not shown any sign of changing your views or attitudes," she said.

Abdallah's trial was delayed after a terror attack at Manchester Arena in May this year carried out by bomber Salman Abedi, in which 22 people were killed.

Abedi attended the same mosque as the Abdallah brothers and reportedly visited Abdalraouf in prison in the months leading up to the attack.