Nevertheless, there were many cases of toleration during the Abbasid era, particularly under the reign of Al-Mu'tasim who flogged an imam and muezzin for destroying a fire-temple and replacing it with a mosque. As a matter of fact, Al-Mu'tasim even allowed rebuilding and the establishment of Zoroastrian fire temples in many places within the borders of the Abbasid Caliphate. It was reported that there were still a significant amounts of strongholds of the Zoroastrian communities in places such as Kerman, Qom, Sistan, Fars and more that were thriving under the Abbasid regime. This is a fact that is not only attested by European explorers of later times, but also the Muslim historians who were present.