Reports have emerged of fighters from the Islamic State group arresting former Baathists and other Sunni rebels who share the aim of toppling the Iraqi government.

Many Sunni Arabs have joined fighters loyal to the self-proclaimed caliph, Abu Bakr al-Baghdadi, in fighting the Iraqi army but do not want the group to take control of the country.

Al Jazeera's Zeina Khodr reports from Erbil.