Security forces on Friday killed four Maoists in an encounter in Jharkhand, including a sub-zonal commander, Sahdev Mahto alias Anuj, carrying a ₹15 lakh reward. The joint operation by CoBRA battalion and district police in the Piparwar-Keredari border area, which lasted for half an hour, also led to the recovery of a large cache of weapons, ammunition, and Maoist materials.