The weekly Al-Nabaa online magazine of the Islamic State group says Mohammad Daleel took three months to prepare the bomb that wounded 15 people and killed him in the German town of Ansbach.

The magazine's report, published late Tuesday, added that the 27-year-old Syrian, who went to Germany as an asylum-seeker, had fought in Iraq in the past with a branch of al-Qaida.

Al-Nabaa said after Syria's crisis began in 2011, Daleel carried out attacks against government forces using hand grenades and Molotov cocktails.

When al-Qaida's branch in Syria, the Nusra Front, was founded, he fought with them until he was wounded in a mortar shell attack.

It appears that Daleel pledged alliance to IS after the 2013 split between the Nusra Front and IS.