Suspect claims blogger Sofiene Chourabi and photographer Nadhir Ktari executed in Derna after IS court order.
The Islamic State has been accused of recruiting children in Syria and Iraq as soldiers, called Cubs of the Caliphate.
A man rammed the speeding vehicle into a crowd in the holy city, killing four IDF soldiers.
The US-led coalition said Mahmud al-Isawi was a long-standing member of the Islamic State.
Raqqa is at the centre of an ongoing offensive against the Islamist militant group.
The area in western Anbar was one of the first captured by the Islamic State in 2014.
The Egyptian leader denied allegations made by Isis that al-Qaeda was against attacks on Shias.
The execution comes as Iraqi forces intensify their offensive against Daesh fighters to liberate Mosul.
Blast is the first car bomb attack in Syria since the start of a shaky ceasefire in the country.
Bonn museum already displays several artefacts from historical German terror groups and attacks.
Kurdish fighters and the Syrian Democratic Forces (SDF) are leading a massive offensive against the jihadists in Syria.
Police say the arrest is not thought to be linked to Isis.
The UN said an unprecedented number of refugees had fled Mosul since October 2016.
The 19-year-old allegedly fought for the terror group in Syria before being deployed to Germany.
The firebrand president believes the Islamic State group is behind the recent blasts in the country.
Walid Shekhi, 40, opened the restaurant in Kobani, which was liberated by Isis in January 2015.
The man allegedly asked a contact in the terror group for 180,000 to commit bomb attacks.
Oil is a crucial source of revenue for the Islamist militant group which uses the funds to carry out terrorist attacks.
Turkish authorities say they are near to identifying man suspected of killing 39 at Reina nightclub.
Gunman not believed to be among those detained.
The offensive to retake Mosul was launched in mid-October.
Minister for Security Ben Wallace has spoken about the ongoing threat from 'the enemy within'.