Photos: Beheaded American aid worker Peter Kassig given Muslim funeral service

Hundreds of friends and family of different faiths came together in an Indiana mosque Friday for a funeral service honoring the legacy of Abdul-Rahman Kassig, formerly known as Peter, who was beheaded by ISIS militants in Syria.

Kassig, a 26-year-old former US Army Ranger, converted to Islam and took a new name during his year-long captivity. 

On Friday, Kassig's loved ones attended the funeral service in the mosque at Al-Huda Foundation in the Indianapolis suburb of Fishers, which included a sermon by a prominent Syrian exile, cleric and Muslim scholar Shaykh Muhammad al-Yaqoubi, formerly Imam of the Grand Umayyad Mosque in Damascus, who flew in from Washington DC to deliver the eulogy.

'He took every risk in order to help the Syrian people, to remove some of their tragedy, to offer them some relief,' al-Yaqoubi said. He called Kassig 'one of our brothers who sacrificed his life for the sake of God.'

He offered condolences to Ed and Paula Kassig, Peter's parents, calling their son a great hero 'who carried in his heart the principles of Islam even before becoming a Muslim.'