HOSHANGABAD: The tehsil office of Piparia has been locked by the employees in protest against the attack the tehsildar by the mining mafia. All the employees led by Tehsildar have sat on a dharna demanding arrest of the assailants. The mafia has attacked tehsildar Vinki Singhmare on Thursday. She was not hurt but the driver sustained injuries. He has been admitted to the Piparia hospital. She was informed about illegal mining in village Mahori Kala and had reached the place to check on it.