Resistance to these policies in Baghdad eventually culminated in 846, when supporters of orthodoxy led by Ahmad ibn Nasr al-Khuza'i formed plans to launch a popular rebellion against the central government. The conspiracy was discovered, however, prior to the scheduled date of the revolt, and Ahmad was arrested by an agent of Ishaq's brother Muhammad ibn Ibrahim al-Mus'abi (Ishaq himself having been absent from the city at the time of the incident). Ishaq then took part in al-Wathiq's interrogation of the rebel leader in Samarra, and on his orders a number of Ahmad's supporters were rounded up and imprisoned.[18]