Raipur, Mar 14 (ANI): Congress party, opposition in Chhattisgarh, called for a state-wide shutdown on Friday to protest the recent Maoist attack, which killed 16 security personnel involved in a mine clearing operation. As a mark of protest, the Congress members came out in droves in Raipur and tied black ribbons on the arms of people. Congress party member, Vikas Upadhyay, expressed grief over the killing of many security personnel, politicians and tribals.