Four BJP functionaries, including Raipur District BJP unit chief, were arrested for allegedly thrashing a local journalist at the party office here, police said on Sunday. BJP's Raipur district president Rajeev Agrawal and three office-bearers Vijay Vyas, Utkarsh Trivedi and Deena Dongre were arrested late on Saturday on the basis of an FIR lodged by journalist Suman Pandey, a police official told PTI.