A Central Reserve Police Force (CRPF) officer was killed and nine others were injured after an IED blast in Chhattisgarh's Sukma district triggered by Maoists, officials said today. The attack took place at around 8.30pm on Saturday at Arabraj metta hills near Chintalnar forest, over 450 km from state capital Raipur, and the injured personnel were evacuated by a helicopter. All officials belonged to the 206th Commando Battalion for Resolute Action (CoBRA).