A US man who is already serving 25 years in prison for attempting to kill Sir Salman Rushdie has been convicted of additional charges, including providing material support to a terrorist group.

Axar.az reports, citing BBC, Hadi Matar was convicted in a New York federal court on Wednesday of providing assistance to Hezbollah, the Lebanese armed faction which is designated as a terrorist group by the US, UK and many other countries.

Prosecutors argued that Matar had been motivated by a fatwa, a religious edict, issued by Iran's religious leader in 1989 for Sir Salman's death.

The award-winning author testified during the trial, describing the attack and crediting a firefighter with saving his life by providing medical care.

The jury convicted Matar of engaging in an act of transnational terrorism and providing material support to Hezbollah.