Four officers of the Border Security Force, including a Commanding Officer, were on Friday killed in an IED blast by suspected Maoists in Malkangiri district of Odisha. The BSF squad was targeted at around 1 pm in the Janbai area of the district, under Chitragonda police station area, 465 kms from Bhubaneswar. Odisha's jungles are a hotbed for Naxal activities as it touches the borders of two other states -- Andhra Pradesh and Chhattisgarh -- making it a corridor for Maoists.